Medical Dictionary

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oleometer (o-le-om′e-ter)
An instrument, similar to a hydrometer, for determining the specific gravity of oils. SYN: eleometer. [oleo- + G. metron, measure]

oleopalmitate (o′le-o-pal′mi-tat)
A double salt of oleic and palmitic acids.

oleoresin (o′le-o-rez′in)
1. A compound of an essential oil and resin, present in certain plants. 2. A pharmaceutical preparation. See aspidium, capsicum, ginger. 3. SYN: balsam.

oleosaccharum, pl .oleosacchara (o′le-o-sak′a-rum)
A class of preparations made by the trituration of a volatile oil (such as anise, fennel, or lemon) with sugar; used as a diluent or corrigent of powerful or bad-tasting drugs in powder form. SYN: oil sugar. [oleo- + G. saccharon, sugar]

oleostearate (o′le-o-ste′a-rat)
A double salt of oleic and stearic acids.

oleosus (o-le-o′sus)
Greasy; relating to abnormality of the sebaceous apparatus. [L., fr. oleum, oil]

oleotherapy (o′le-o-thar′a-pe)
Treatment of disease by an oil given internally or applied externally. SYN: eleotherapy. [oleo- + G. therapeia, therapy]

oleovitamin (o′le-o-vi′ta-min)
A solution of a vitamin in an edible oil. o. A and D a solution of vitamins A and D in fish liver oil or in an edible vegetable oil.

oleum terebinthinae (o′le-um ter-e-ben′thin-i)
SYN: turpentine oil.

oleyl alcohol (o-le′il)
A mixture of aliphatic alcohols consisting chiefly of CH3(CH2)7CH&dbond;CH(CH2)7CH2OH; used as an emulsifying aid and in the preparation of cold cream; found in fish oils.

oleyl-CoA (o-le′il)
A product of the Δ9-desaturase enzyme system in the biosynthesis of monounsaturated fatty acids. SYN: oleyl-coenzyme A.

oleyl-coenzyme A
SYN: oleyl-CoA.

olfactie, olfacty (ol-fak′te)
The unit of smell; the threshold of olfactory stimulation, or the point at which the smell is just received in the olfactometer. [see olfaction]

olfaction (ol-fak′shun)
1. The sense of smell. SYN: smell (2) . 2. The act of smelling. SYN: osmesis, osphresis. [L. ol- facio, pp. -factus, to smell]

olfactology (ol′fak-tol′-o-je)
Study of the sense of smell. [olfaction + G. logos, study]

olfactometer (ol′fak-tom′e-ter)
A device for estimating the sensitivity to odorants. [L. olfactus, smell, + G. metron, measure]

olfactometry (ol′fak-tom′e-tre)
Determination of the degree of sensitivity to odorants.

olfactophobia (ol-fak-to-fo′be-a)
Morbid fear of odors. SYN: osmophobia, osphresiophobia. [L. olfactus, smell, + G. phobos, fear]

olfactory (ol-fak′to-re)
Relating to the sense of smell. SYN: osmatic, osphretic. [see olfaction]

olibanum (o-lib′a-num)
A gum resin from several trees of the genus Boswellia (family Burseraceae); has been used as a stimulant expectorant in bronchitis, for fumigations, and as incense. SYN: frankincense, thus. [Ar. al, the, + luban, frankincense]

olig-
See oligo-.

oligamnios (ol-i-gam′ne-os)
SYN: oligohydramnios.

oligemia (ol-i-ge′me-a)
A deficiency in the amount of blood in the body or any organ or tissue. [oligo- + G. haima, blood]

oligemic (ol-i-ge′mik)
Pertaining to or characterized by oligemia.

olighidria, oligidria (ol-ig-hid′re-a, -id′re-a)
Scanty perspiration. [oligo- + G. hidros, sweat]

oligo (ol′i-go)
In molecular genetics, oligonucleotide.

oligo-, olig-
1. A few, a little; too little, too few. 2. In chemistry, used in contrast to “poly-” in describing polymers; e.g., oligosaccharide. [G. oligos, few]

oligoamnios (ol′i-go-am′ne-os)
SYN: oligohydramnios. [oligo- + amnion]

oligocholia (ol′i-go-ko′le-a)
A deficient secretion of bile. [oligo- + G. chole, bile]

oligochylia (ol′i-go-ki′le-a)
A deficiency of gastric juice. [oligo- + G. chylos, juice]

oligochymia (ol′i-go-ki′me-a)
A deficiency of chyme. [oligo- + G. chymos, juice]

oligocystic (ol′i-go-sis′tik)
Consisting of only a few cysts, as occasionally observed in certain examples of hydatidiform mole and other lesions that ordinarily have numerous cysts. [oligo- + G. kystis, bladder, cyst]

oligodactyly, oligodactylia (ol′i-go-dak′ti-le, -dak-til′e-a)
Presence of fewer than five digits on one or more limbs. [oligo- + G. daktylos, finger or toe]

oligodendria (ol′i-go-den′dre-a)
SYN: oligodendroglia.

oligodendroblast (ol′i-go-den′dro-blast)
A primitive glial cell that is the normal precursor cell of the oligodendrocyte.

oligodendroblastoma (ol′i-go-den′dro-blas-to′ma)
Obsolete term for oligodendroglioma. [oligo- + G. dendron, tree, + blastos, germ, + -oma]

oligodendrocyte (ol′i-go-den′dro-sit)
A cell of the oligodendroglia.

oligodendroglia (ol′i-go-den-drog′le-a)
One of the three types of glia cells (the other two being macroglia or astrocytes, and microglia) that, together with nerve cells, compose the tissue of the central nervous system. O. cells are characterized by variable numbers of veillike or sheetlike processes that are wrapped each around individual axons to form the myelin sheath of nerve fibers in the central nervous system (compared with Schwann cells in the peripheral nervous system); forms myelin in the central nervous system; accordingly, they are more numerous in white matter than in gray matter. SYN: oligodendria. [oligo- + G. dendron, tree, + glia, glue]

oligodendroglioma (ol′i-go-den′dro-gli-o′ma)
A relatively rare, relatively slowly growing glioma derived from oligodendrocytes that occurs most frequently in the cerebrum of adult persons; the neoplasm is grossly homogeneous, fairly well circumscribed, moderately firm, and somewhat gritty in consistency with interstitial calcification sufficiently dense so as to be detected by x-ray imaging of the skull. Microscopically, an o. is characterized by numerous small, round or ovoid, oligodendroglial cells with small, deeply stained nuclei (rarely observed in mitosis), and palely stained, indistinct cytoplasm; the neoplastic cells are rather uniformly distributed in a sparse, fibrillary stroma with scattered calcific bodies and an often prominent arcuate vasculature. [oligo- + G. dendron, tree, + glia, + -oma] anaplastic o. an aggressive o. characterized by prominent nuclear pleomorphism, mitoses, and increased cellularity. SYN: pleomorphic o.. pleomorphic o. SYN: anaplastic o..

oligodipsia (ol′i-go-dip′se-a)
Abnormal lack of thirst. SEE ALSO: hypodipsia. [oligo- + G. dipsa, thirst]

oligodontia (ol′i-go-don′she-a)
SYN: hypodontia. [oligo- + G. odous, tooth]

oligodynamic (ol′i-go-di-nam′ik)
Active in very small quantity; e.g., the germicidal effect of an exceedingly dilute solution (such as one to one hundred million) of copper in distilled water. [oligo- + G. dynamis, power]

oligogalactia (ol′i-go-ga-lak′te-a, -she-a)
Slight or scant secretion of milk. [oligo- + G. gala, milk]

oligoglucan-branching glycosyltransferase (ol′i-go-gloo′kan)
SYN: 1,4-α-d-glucan 6-α-d-glucosyltransferase.

oligo-α-1,6-glucosidase
A glucanohydrolase cleaving α-1,6 links in isomaltose and dextrins produced from starch and glycogen by α-amylase; secreted into the duodenum; a deficiency of this enzyme leads to defects in intestinal digestion of limit dextrins. SEE ALSO: sucrose α-d-glucohydrolase. SYN: isomaltase, limit dextrinase (2) .

oligohydramnios (ol′i-go-hi-dram′ne-os)
The presence of an insufficient amount of amniotic fluid (less than 300 mL at term). SYN: hypamnion, hypamnios, oligamnios, oligoamnios. [oligo- + G. hydor, water, + amnion]

oligohydruria (ol′i-go-hi-droo′re-a)
Obsolete term for excretion of small quantities of urine, as seen in dehydration. [oligo- + G. hydor, water, + ouron, urine]

oligolecithal (ol′i-go-les′i-thal)
Having little yolk; denoting an egg in which there is only a little scattered deutoplasm. [oligo- + G. lekithos, yolk]

oligomenorrhea (ol′i-go-men-o-re′a)
Scanty menstruation. [oligo- + menorrhea]

oligomer (ol′i-go-mer)
A polymer containing only a few repeating units, a “few” generally considered as fewer than 20.

oligomorphic (ol′-i-go-mor′fik)
Presenting few changes of form; not polymorphic. [oligo- + G. morphe, form]

oligonephronic (ol′i-go-nef-ron′ik)
Characterized by a reduced number of nephrons.

oligonucleotide (ol′i-go-noo′kle-o-tid)
A compound made up of the condensation of a small number (typically fewer than 20) of nucleotides. Cf.:polynucleotide.

oligopepsia (ol′i-go-pep′se-a)
SYN: hypopepsia.

oligopeptide (ol′igo-pep-tid)
A peptide whose molecule contains a few amino acid residues up to about 20.

oligophrenia (ol′i-go-fre′ne-a)
SYN: mental retardation. phenylpyruvate o. SYN: phenylketonuria.

oligoplastic (ol′i-go-plas′tik)
Deficient in reparative power. [oligo- + G. plasso, to form]

oligopnea (ol′i-gop-ne′a, -gop′ne-a)
SYN: hypopnea. [oligo- + G. pnoe, breath]

oligoptyalism (ol′i-go-ti′a-lizm, ol′i-gop-ti′)
A scanty secretion of saliva. SYN: oligosialia. [oligo- + G. ptyalon, saliva]

oligoria (ol-i-gor′e-a)
A rarely used term for an abnormal indifference toward or dislike of persons or things. [G. o., negligence, slight esteem, fr. oligos, little, + ora, care, regard]

oligosaccharide (ol′i-go-sak′a-rid)
A compound made up of the condensation of a small number of monosaccharide units. Cf.:polysaccharide.

oligosialia (ol′i-go-si-a′le-a)
SYN: oligoptyalism. [oligo- + G. sialon, saliva]

oligospermia, oligospermatism (ol-i-go-sper′me-a, -ma-tizm)
SYN: oligozoospermia. [oligo- + G. sperma, seed]

oligosymptomatic (ol′i-go-simp-to-mat′ik)
Having few or minor symptoms.

oligosynaptic (ol′i-go-si-nap′tik)
Referring to neural conduction pathways that are interrupted by only a few synaptic junctions, i.e., made up of a sequence of only few nerve cells, in contrast to polysynaptic pathways. SYN: paucisynaptic.

oligothymia (ol′i-go-thi′me-a)
Rarely used term for a poverty or loss of affect. [oligo- + -thymia]

oligotrichia (ol′i-go-trik′e-a)
SYN: hypotrichosis.

oligotrichosis (ol′i-go-tri-ko′sis)
SYN: hypotrichosis.

oligotrophia, oligotrophy (ol′i-go-tro′fe-a, -got′ro-fe)
Deficient nutrition. [oligo- + G. trophe, nourishment]

oligozoospermatism (ol′i-go-zo′o-sper′ma-tizm)
SYN: oligozoospermia. [oligo- + G. zoon, animal, + sperma, seed]

oligozoospermia (ol′i-go-zo′o-sperm′e-a)
A subnormal concentration of spermatozoa in the penile ejaculate. SYN: oligospermia, oligospermatism, oligozoospermatism. [oligo- + G. zoos, living, + sperma, seed, semen, + -ia]

oliguria (ol-i-goo′re-a)
Scanty urine production. [oligo- + G. ouron, urine]

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