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Medical Dictionary


Pieter K., Dutch physician, 1852–1919. See P.-Ebstein disease, P.-Ebstein fever.

pelade (pe-lad′, -lahd′)
SYN: alopecia. [Fr. peler, to remove the hair from a hide]

pelargonic acid (pel-ar-gon′ik)
Used in the manufacture of lacquers and plastics; produced in the oxidative cleavage of oleic acid. SYN: n-nonanoic acid.

Karel, Dutch physician, 1885–1931. See P.-Huët nuclear anomaly.

peliosis (pe-le-o′sis, pel-)
SYN: purpura. [G. p., a livid spot, livor] bacterial p. bacterial infection of hemorrhagic cysts of the liver, spleen, or lymph nodes, seen in immunocompromised persons, caused by Rochalimaea henselae. p. hepatis the presence throughout the liver of blood-filled cavities that may become lined by endothelium or become organized.

Friedrich, German neurologist, 1850–1917. See Merzbacher-P. disease, P.-Merzbacher disease.

pellagra (pe-lag′ra, pe-la′gra)
An affection characterized by gastrointestinal disturbances, erythema (particularly of exposed areas) followed by desquamation, and nervous and mental disorders; may occur because of a poor diet, alcoholism, or some other disease causing impairment of nutrition; commonly seen when corn (maize) is a main nutrient in the diet, resulting in a deficiency of niacin. SYN: Alpine scurvy, maidism, mal de la rosa, mal rosso, mayidism, psychoneurosis maidica, Saint Ignatius itch. [It. pelle, skin, + agra, rough] infantile p. SYN: kwashiorkor. secondary p. p. resulting from any morbid condition that impairs nutrition by increasing the requirement or reducing the available supply of vitamins. p. sine p. p. without the characteristic skin lesions.

pellagroid (pe-lag′royd)
Resembling pellagra.

pellagrous (pe-lag′rus)
Relating to or suffering from pellagra.

Augusto, Italian surgeon, *1877. See P. disease, P.-Stieda disease.

pellet (pel′et)
1. A pilule, or very small pill. 2. A small rod-shaped or ovoid dosage form that is sterile and is composed essentially of pure steroid hormones in compressed form, intended for subcutaneous implantation in body tissues; serves as a depot providing for the slow release of the hormone over an extended period of time. [Fr. pelote; L. pila, a ball]

pellicle (pel′i-kl)
1. Literally and nonspecifically, a thin skin. 2. A film or scum on the surface of a liquid. 3. Cell boundary of sporozoites and merozoites among members of the protozoan subphylum Apicomplexa (Sporozoa), consisting of an outer unit membrane and an inner layer of two unit membranes. [L. pellicula, dim of pellis, skin] acquired p. a thin film (about 1 μm), derived mainly from salivary glycoproteins, that forms over the surface of a cleansed tooth crown when it is exposed to the saliva. SYN: acquired cuticle, acquired enamel cuticle, brown p., posteruption cuticle. brown p. SYN: acquired p..

pellicular, pelliculous (pe-lik′u-lar, -lus)
Relating to a pellicle.

Pietro, Italian dermatologist, 1823–1892. See Jadassohn-P. anetoderma.

G.B., 19th–20th century Italian physician. See P. syndrome.

pellote (pa-yo′ta)
SYN: peyote. [Aztec, peyotl]

pellucid (pe-loo′sid)
Allowing the passage of light. [L. pellucidus]

pelma (pel′ma)
SYN: sole. [G.]

pelmatic (pel-mat′ik)
Relating to the sole of the foot. [G. pelma, sole]

pelmatogram (pel-mat′o-gram)
An imprint of the sole of the foot, made by resting the inked foot on a sheet of paper, or by pressing the greased foot on a plaster of Paris paste. [G. pelma (pelmat-), sole of the foot, + gramma, a picture]

pelopathy (pe-lop′a-the)
SYN: pelotherapy. [G. pelos, mud, + pathos, suffering]

pelotherapy (pe′lo-thar-a-pe)
Application of peloids, such as mud, peat, or clay, to all or part of the body. SYN: pelopathy. [G. pelos, mud, + therapeia, treatment]

pelta (pel′ta)
A crescentic, silver-staining, membranous organelle located anteriorly near the base of the flagella in certain flagellate protozoa, as in Trichomonas. [L. a shield]

peltation (pel-ta′shun)
Protection provided by inoculation with an antiserum or with a vaccine. [L. pelta, a light shield, fr. G. pelte]

pelvi-, pelvio-, pelvo-
The pelvis. Cf.:pyelo-, pelyco-. [L. pelvis, basin (pelvis)]

pelvic (pel′vik)
Relating to a pelvis.

pelvic direction (pel′vik di-rek′shun)
The direction of the axis of the pelvis.

pelvicephalography (pel′vi-sef-a-log′ra-fe)
SYN: cephalopelvimetry. [pelvi- + G. kephale, head, + grapho, to write]

pelvicephalometry (pel′vi-sef-a-lom′e-tre)
Measurement of the female pelvic diameters in relation to those of the fetal head. [pelvi- + G. kephale, head, + metron, measure]

pelvifixation (pel-vi-fik-sa′shun)
Surgical attachment of a floating pelvic organ to the wall of the pelvic cavity.

pelvilithotomy (pel′vi-li-thot′o-me)
SYN: pyelolithotomy. [pelvi- + G. lithos, stone, + tome, incision]

pelvimetry (pel-vim′e-tre)
Measurement of the diameters of the pelvis. SYN: radiocephalpelvimetry. [pelvi- + G. metron, measure] CT p. procedure for measurement of the bony pelvis and fetal head through use of CT images; currently the more accurate imaging technique. manual p. measurement of the essential diameters of the bony pelvis using the hands. radiographic p. procedure for measurement of the bony pelvis and fetal head using anteroposterior and lateral radiographs, with a device for the correction of magnification.

See pelvi-.

pelviolithotomy (pel-ve-o-li-thot′o-me)
SYN: pyelolithotomy.

pelvioperitonitis (pel′ve-o-per-i-to-ni′tis)
SYN: pelvic peritonitis.

pelvioplasty (pel′ve-o-plas-te)
SYN: pyeloplasty. [pelvio- + G. plastos, formed]

pelvioscopy (pel-ve-os′ko-pe)
Examination of the pelvis for any purpose, usually by endoscopy. SYN: pelvoscopy. [pelvio- + G. skopeo, to view]

pelviperitonitis (pel-ve-per-i-to-ni′tis)
SYN: pelvic peritonitis.

pelvis, pl .pelves (pel′vis, pel′vez) [TA]
1. [NA] The massive cup-shaped ring of bone, with its ligaments, at the lower end of the trunk, formed of the hip bone (the pubic bone, ilium, and ischium) on either side and in front, and the of sacrum and coccyx posteriorly. 2. Any basinlike or cup-shaped cavity, as the p. of the kidney. [L. basin] android p. a masculine or funnel-shaped p.. anthropoid p. p. with a long anteroposterior diameter and a narrow transverse diameter. assimilation p. a deformity in which the transverse processes of the last lumbar vertebra are fused with the sacrum, or the last sacral with the first coccygeal body. beaked p. SYN: osteomalacic p.. brachypellic p. a p. in which the transverse diameter is more than 1 cm longer but less than 3 cm longer than the anteroposterior diameter. SYN: transverse oval p.. caoutchouc p. in osteomalacia, a p. in which the bones are still soft. SYN: rubber p.. contracted p. a p. with less than normal measurements in any diameter. cordate p., cordiform p. a p. with sacrum projecting forward between the ilia, giving to the brim a heart shape. SYN: heart-shaped p.. Deventer p. a p. with shortened anteroposterior diameter. dolichopellic p. a p. in which the anteroposterior diameter is longer than the transverse. SYN: longitudinal oval p.. dwarf p. a very small p., in which the several bones are united by cartilage as in the infant. SYN: p. nana. false p. SYN: greater p.. flat p. a p. in which the anteroposterior diameter is uniformly contracted, the sacrum being dislocated forward between the iliac bones. SYN: p. plana. frozen p. a condition in which the true p. is indurated throughout, especially by carcinoma. SYN: hardened p.. funnel-shaped p. a p. in which the pelvic inlet dimensions are normal, but the outlet is contracted in the transverse or in both transverse and anteroposterior diameters. p. of gallbladder SYN: Hartmann pouch. greater p. [TA] the expanded portion of the p. above the brim. SYN: p. major [TA] , false p., large p., p. spuria. gynecoid p. the normal female p.. hardened p. SYN: frozen p.. heart-shaped p. SYN: cordate p.. inverted p. split p. with separation at pubis. p. justo major a symmetrical p. with greater than normal measurements in all diameters. p. justo minor a p. of the female type, but with all its diameters smaller than normal. juvenile p. a p. justo minor in which the bones are slender. kyphoscoliotic p. a p. with marked anteroposterior curvature of the spine combined with lateral spinal curvature, usually due to severe rickets. kyphotic p. a deformed p. associated with a kyphotic deformity of the spine. large p. SYN: greater p.. lesser p. [TA] the cavity of the p. below the brim or superior aperture. SYN: p. minor [TA] , p. vera, small p., true p.. longitudinal oval p. SYN: dolichopellic p.. lordotic p. a deformed p. associated with a lordotic curvature of the spine. p. major [TA] SYN: greater p.. masculine p. 1. a p. justo minor in which the bones are large and heavy; 2. a slight degree of funnel-shaped p. in the woman, in which the shape approximates that of the male p.. mesatipellic p. obsolete term for one in which the anteroposterior and transverse diameters are equal or the transverse diameter is not more than 1 cm longer than the anteroposterior diameter. SYN: round p.. p. minor [TA] SYN: lesser p.. Nägele p. an obliquely contracted or unilateral synostotic p., marked by arrest of development of one lateral half of the sacrum, usually ankylosis of the sacroiliac joint on that side, rotation of the sacrum toward the same side, and deviation of the symphysis pubis to the opposite side. p. nana SYN: dwarf p.. p. obtecta a form of kyphotic p. in which the angular curvature of the spine is low and extreme so that the spinal column projects horizontally across the inlet of the p.. osteomalacic p. a pelvic deformity in osteomalacia; the pressure of the trunk on the sacrum and lateral pressure of the femoral heads produce a pelvic aperture that is three-cornered or has the shape of a heart or a cloverleaf, while the pubic bone becomes beak shaped. SYN: beaked p., rostrate p.. Otto p. SYN: Otto disease. p. plana SYN: flat p.. platypellic p. flat oval p., in which the transverse diameter is more than 3 cm longer than the anteroposterior diameter. platypelloid p. simple flat p.. Prague p. SYN: spondylolisthetic p.. pseudoosteomalacic p. an extreme degree of rachitic p., resembling the puerperal osteomalacic p., in which the pelvic canal is obstructed by a forward projection of the sacrum, and an approximation of the acetabula. rachitic p. a contracted and deformed p.; most commonly, a flat p. occurring from rachitic softening of the bones in early life. renal p. [TA] a flattened funnel-shaped expansion of the upper end of the ureter receiving the calices, the apex being continuous with the ureter. SYN: p. renalis [TA] , ureteric p.. p. renalis [TA] SYN: renal p.. reniform p. a modified cordate p., with a long transverse diameter, giving the brim a kidney shape. Robert p. obsolete term for a p. that is narrowed transversely in consequence of the almost entire absence of the alae of the sacrum. Rokitansky p. SYN: spondylolisthetic p.. rostrate p. SYN: osteomalacic p.. round p. SYN: mesatipellic p.. rubber p. SYN: caoutchouc p.. scoliotic p. a deformed p. associated with lateral curvature of the spine. small p. SYN: lesser p.. spider p. narrow calices of renal p.. split p. a p. in which the symphysis pubis is absent, the pelvic bones being separated by quite an interval; usually associated with exstrophy of the bladder. spondylolisthetic p. a p. whose brim is more or less occluded by a forward dislocation of the body of the lower lumbar vertebra. SYN: Prague p., Rokitansky p.. p. spuria SYN: greater p.. transverse oval p. SYN: brachypellic p.. true p. SYN: lesser p.. ureteric p. SYN: renal p.. p. vera SYN: lesser p..

pelvisacral (pel-vi-sa′kral)
Relating to both the pelvis, or hip bones, and the sacrum.

pelviscope (pel′vi-skop)
Endoscopic instrument for examining the interior of the pelvis. [pelvi- + G. skopeo, to view]

pelvitherm (pel′vi-therm)
Instrument for applying heat to the pelvic organs. [pelvi- + G. therme, heat]


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