SYN: scrotoplasty. [oscheo- + plastos, formed]
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]
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.
An instrument that records oscillations, usually electrical.
The study of the records made by an oscillograph.
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]
Relating to the oscillometer or the records made by its use.
The measurement of oscillations of any kind with an oscillometer.
The subjective sensation of oscillation of objects viewed. SYN: oscillating vision. [L. oscillo, to swing, + G. opsis, vision]
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.
To yawn; to gape. [L. oscito, fr. os, mouth, + cieo, to put in motion]
SYN: yawning. [L. oscitatio]
osculum, pl .oscula (os′ku-lum, -la)
A pore or minute opening. [L. dim. of os, mouth]
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]
Plural of -osis.
Robert B., U.S. orthopedic surgeon, 1873–1956. See O.-Schlatter disease.
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.]
Sir William, Canadian physician in U.S. and England, 1849–1919. See O. disease, O. node, O. sign, Rendu-O.-Weber syndrome.
A salt of osmic acid.
SYN: olfactory. [G. osme, smell]
SYN: chondrodystrophy with sensorineural deafness.
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.
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.
The science of olfaction. [G. osme, smell]
Readily stained with osmic acid. [osmium + G. phileo, to love]
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.
1. Osmosis. [G. osmos, impulsion] 2. Smell, odor. [G. osme]
osmoceptor (os-mo-sep′ter, tor)
An abnormal dislike of certain odors. [G. osme, smell, + dys-, bad, + phora, a carrying]
SYN: electroolfactogram. [G. osme, smell, + gramma, a drawing]
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.
The osmotic concentration of an osmotically active substance in solution, expressed as osmoles of solute particles per liter of solution.
The molecular weight of a solute, in grams, divided by the number of ions or particles into which it dissociates in solution.
1. The study of odors, their production, and their effects. SYN: osphresiology. 2. The study of osmosis.
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.
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]
SYN: olfactophobia. [G. osme, smell, + phobia]
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.
Influencing the degree and rapidity of osmosis.
To move through a membrane by osmosis.
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.
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.
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]
Relating to osmosis. SYN: osmolar.
Odor; sense of smell. [G. osphresis, smell]
Relating to osphresiology.
SYN: osmology (1) . [osphresio- + G. logos, study]
An unusual interest in odors. [osphresio- + G. phileo, to love]
SYN: olfactophobia. [osphresio- + G. phobos, fear]
SYN: olfaction. [G. o., smell]
Plural of L. os, bone. [L.]
ossein, osseine (os′e-in)
SYN: collagen. [L. os, bone]
Bony. SEE ALSO: ossi-, osteo-. [L. osseus]
Relating to, or composed of, both bone and cartilage. SYN: osteocartilaginous, osteochondrous.
The ground substance of bony tissue.
A mucoid derived from ossein.
Bony, of bone-like consistency or structure. SYN: osteal. [L. osseus]
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.
Plural of ossiculum. [L.]
Pertaining to an ossicle.
Removal of one or more of the ossicles of the middle ear. [L. ossiculum, ossicle, + G. ektome, excision]
Division of one of the ossicles of the middle ear. [L. ossiculum, ossicle, + G. tome, incision]