Medical Dictionary

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oscheoplasty (os′ke-o-plas-te)
SYN: scrotoplasty. [oscheo- + plastos, formed]

oscillation (os-i-la′shun)
1. A to-and-fro movement. 2. A stage in the vascular changes in inflammation in which the accumulation of leukocytes in the small vessels arrests the passage of blood and there is simply a to-and-fro movement at each cardiac contraction. [L. oscillatio, fr. oscillo, to swing]

oscillator (os′si-la-ter)
1. An apparatus somewhat like a vibrator, used to give a form of mechanical massage. 2. An electric circuit designed to generate alternating current at a particular frequency. 3. Any device that produces oscillation.

oscillograph (o-sil′o-graf)
An instrument that records oscillations, usually electrical.

oscillography (os-i-log′ra-fe)
The study of the records made by an oscillograph.

oscillometer (os-i-lom′e-ter)
An apparatus for measuring oscillations of any kind, especially those of the bloodstream in sphygmometry. SEE ALSO: sphygmo-o.. [L. oscillo, to swing, + G. metron, measure]

oscillometric (os′i-lo-met′rik)
Relating to the oscillometer or the records made by its use.

oscillometry (os-i-lom′e-tre)
The measurement of oscillations of any kind with an oscillometer.

oscillopsia (os-i-lop′se-a)
The subjective sensation of oscillation of objects viewed. SYN: oscillating vision. [L. oscillo, to swing, + G. opsis, vision]

oscilloscope (o-sil′o-skop)
An oscillograph in which the record of oscillations is continuously visible. cathode ray o. (CRO) the common form of o., in which a varying electrical signal (y) vertically deflects an electron beam impinging on a fluorescent screen, while some other function (x or time) deflects the beam horizontally; the result is a visual graph of y plotted against x or time with negligible distortion by inertia. storage o. a cathode ray o. in which the visual record of oscillations persists on the fluorescent screen until erased electrically.

oscitate (os′i-tat)
To yawn; to gape. [L. oscito, fr. os, mouth, + cieo, to put in motion]

oscitation (os′i-ta′shun)
SYN: yawning. [L. oscitatio]

osculum, pl .oscula (os′ku-lum, -la)
A pore or minute opening. [L. dim. of os, mouth]

-ose
1. In chemistry, a terminator usually indicating a carbohydrate. 2. Suffix appended to some Latin roots, with significance of the more common -ous (2) . [L. -osus, full of, abounding]

-oses
Plural of -osis.

Osgood
Robert B., U.S. orthopedic surgeon, 1873–1956. See O.-Schlatter disease.

OSHA
Abbreviation for Occupational Safety and Health Administration of the U.S. Department of Labor, responsible for establishing and enforcing safety and health standards in the workplace.

-osis, pl .-oses
Suffix meaning a process, condition, or state, usually abnormal or diseased; production or increase, physiologic or pathologic; an invasion or infestation; in the latter sense, it is similar to and often interchangeable with Greek -iasis, as seen in trichinosis, trichiniasis. [G.]

Osler
Sir William, Canadian physician in U.S. and England, 1849–1919. See O. disease, O. node, O. sign, Rendu-O.-Weber syndrome.

osmate (os′mat)
A salt of osmic acid.

osmatic (oz-mat′ik)
SYN: olfactory. [G. osme, smell]

OSMED
SYN: chondrodystrophy with sensorineural deafness.

osmesis (oz-me′sis)
SYN: olfaction. [G. o., smelling]

osmic acid (oz′mik)
OsO4;a volatile caustic and strong oxidizing agent; colorless crystals, poorly soluble in water, but soluble in organic solvents; the aqueous solution is a fat and myelin stain and a general fixative for electron microscopy. SYN: osmium tetroxide.

osmicate (oz′mi-kat)
To stain or fix with osmic acid.

osmication, osmification (os′mi-ka′shun, os′mi-fi-ka′shun)
The fixation of tissue with an osmic acid solution; also serves as a stain for both light and electron microscopy.

osmics (oz′miks)
The science of olfaction. [G. osme, smell]

osmiophilic (oz′mi-o-fil′ik)
Readily stained with osmic acid. [osmium + G. phileo, to love]

osmiophobic (oz′mi-o-fo′bik)
Not readily stained with osmic acid. [osmium + G. phobos, fear]

osmium (Os) (oz′me-um)
A metallic element of the platinum group, atomic no. 76, atomic wt. 190.2. [G. osme, smell, because of the strong odor of the tetroxide] o. tetroxide SYN: osmic acid.

osmo-
1. Osmosis. [G. osmos, impulsion] 2. Smell, odor. [G. osme]

osmoceptor (os-mo-sep′ter, tor)
SYN: osmoreceptor.

osmodysphoria (oz′mo-dis-for′e-a)
An abnormal dislike of certain odors. [G. osme, smell, + dys-, bad, + phora, a carrying]

osmogram (oz′mo-gram)
SYN: electroolfactogram. [G. osme, smell, + gramma, a drawing]

osmolality (os-mo-lal′i-te)
The concentration of a solution expressed in osmoles of solute particles per kilogram of soluent. calculated serum o. the calculation of serum o. from serum sodium, glucose, and urea nitrogen values by a variety of formulae, the most common of which is: 1.86 × [Na] (mmol/L + glucose (mg/dL)/18 + BUN (mg/dL)/2.8.

osmolar (os-mo′lar)
SYN: osmotic.

osmolarity (os-mo-lar′i-te)
The osmotic concentration of an osmotically active substance in solution, expressed as osmoles of solute particles per liter of solution.

osmole (os′mol)
The molecular weight of a solute, in grams, divided by the number of ions or particles into which it dissociates in solution.

osmology (os-mol′o-je)
1. The study of odors, their production, and their effects. SYN: osphresiology. 2. The study of osmosis.

osmometer (os-mom′e-ter)
1. An instrument for measuring osmolality by freezing point depression or vapor pressure elevation techniques. 2. An apparatus for measuring the acuteness of the sense of smell.

osmometry (os-mom′e-tre)
Measurement of osmolality by use of an osmometer.

osmophil, osmophilic (os′mo-fil, -fil′ik)
Flourishing in a medium of high osmotic pressure. [osmo(sis) + G. phileo, to love]

osmophobia (oz-mo-fo′be-a)
SYN: olfactophobia. [G. osme, smell, + phobia]

osmophore (oz′mo-for)
The group of atoms in the molecule of a compound that is responsible for the compound's characteristic odor. [G. osme, smell, + phonos, bearing]

osmoreceptor (os′mo-re-sep′ter, -tor)
1. A receptor in the central nervous system (probably the hypothalamus) that responds to changes in the osmotic pressure of the blood. [G. osmos, impulsion] 2. A receptor that receives olfactory stimuli. [G. osme, smell] SYN: osmoceptor.

osmoregulatory (os-mo-reg′u-la-tor-e)
Influencing the degree and rapidity of osmosis.

osmose (os′mos)
To move through a membrane by osmosis.

osmosis (os-mo′sis)
The process by which solvent tends to move through a semipermeable membrane from a solution of lower to a solution of higher osmolal concentration of the solutes to which the membrane is relatively impermeable. [G. osmos, a thrusting, an impulsion] reverse o. movement of solvent in the opposite direction from o., i.e., pressure filtration of solvent through a semipermeable membrane that will hold back the solutes; commonly replaced by filtration or ultrafiltration when speaking of capillary membranes, as in the renal glomerulus.

osmosity (os-mos′i-te)
An indirect measure of the osmotic characteristics of a solution, in terms of a comparable sodium chloride solution, now rendered obsolete by the more precisely defined term osmolality.

osmotherapy (os′mo-thar′a-pe)
Dehydration by means of intravenous injections of hypertonic solutions of sodium chloride, dextrose, urea, mannitol, or other osmotically active substances, or by oral administration of glycerine, isosorbide, glycine, etc.; used in the treatment of cerebral edema and increased intracranial pressure. [osmosis + therapy]

osmotic (os-mot′ik)
Relating to osmosis. SYN: osmolar.

osphresio-
Odor; sense of smell. [G. osphresis, smell]

osphresiologic (os-fre-ze-o-loj′ik)
Relating to osphresiology.

osphresiology (os-fre′ze-ol′o-je)
SYN: osmology (1) . [osphresio- + G. logos, study]

osphresiophilia (os-fre′ze-o-fil′e-a)
An unusual interest in odors. [osphresio- + G. phileo, to love]

osphresiophobia (os-fre′ze-o-fo′be-a)
SYN: olfactophobia. [osphresio- + G. phobos, fear]

osphresis (os-fre′sis)
SYN: olfaction. [G. o., smell]

osphretic (os-fret′ik)
SYN: olfactory.

ossa (os′a)
Plural of L. os, bone. [L.]

ossein, osseine (os′e-in)
SYN: collagen. [L. os, bone]

osseo-
Bony. SEE ALSO: ossi-, osteo-. [L. osseus]

osseocartilaginous (os′e-o-kar-ti-laj′i-nus)
Relating to, or composed of, both bone and cartilage. SYN: osteocartilaginous, osteochondrous.

osseomucin (os′e-o-mu′sin)
The ground substance of bony tissue.

osseomucoid (os′e-o-mu′koyd)
A mucoid derived from ossein.

osseous (os′e-us)
Bony, of bone-like consistency or structure. SYN: osteal. [L. osseus]

ossi-
Bone. SEE ALSO: osseo-, osteo-. [L. os]

ossicle (os′i-kl) [TA]
A small bone; specifically, one of the bones of the tympanic cavity or middle ear. SYN: ossiculum [TA] , bonelet. [L. ossiculum, dim. of os, bone] Andernach ossicles SYN: sutural bones, under bone. auditory ossicles [TA] the small bones of the middle ear; they are articulated to form a chain for the transmission of sound from the tympanic membrane to the oval window. SYN: ossicula auditus [TA] , ear bones, ossicular chain. Bertin ossicles SYN: sphenoidal conchae, under concha. epactal ossicles SYN: sutural bones, under bone. Kerckring o. SYN: Kerckring center.

ossicula (o-sik′u-la)
Plural of ossiculum. [L.]

ossicular (o-sik′u-lar)
Pertaining to an ossicle.

ossiculectomy (os′i-ku-lek′to-me)
Removal of one or more of the ossicles of the middle ear. [L. ossiculum, ossicle, + G. ektome, excision]

ossiculotomy (os′i-ku-lot′o-me)
Division of one of the ossicles of the middle ear. [L. ossiculum, ossicle, + G. tome, incision]

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