||Op`ol*che"ni*e (?), n. [Russ., fr. opolchit' to make an army, polk army. Cf. Folk.] (Russia) See Army organization, above.
Op*tom"e*trist (?), n. One who is skilled in or practices optometry.
Op*tom"e*try (?), n. 1. (Med.) Measurement of the range of vision, esp. by means of the optometer.
2. As defined (with minor variations) in the statutes of various States of the United States: (a) "The employment of subjective and objective mechanical means to determine the accomodative and refractive states of the eye and the scope of its function in general." (b) "The employment of any means, other than the use of drugs, for the measurement of the powers of vision and adaptation of lenses for the aid thereof."
O"ri*ent, v. t. 1. Same as Orientate, 2.
2. To place (a map or chart) so that its east side, north side, etc., lie toward the corresponding parts of the horizon; specif. (Surv.), to rotate (a map attached to a plane table) until the line of direction between any two of its points is parallel to the corresponding direction in nature.
{ Or"mazd (?) or A`hu*ra-Maz"da }, n. [Zend Ahuramazda.] (Zoroastrianism) The supreme deity, the principle of good, creator of the world, and guardian of mankind. He is the opponent of Ahriman, the spirit of evil, both being sprung from Eternity, or, according to another version, Ahriman being the offspring of a moment of doubt on the part of Ormazd. Ormazd is attended by angels and archangels. He is represented as a bearded man inclosed in a winged circle, a conception probably derived from the Assyrian representations of Ashur.
Or"o*graph (?), n. [Gr. &?; mountain + -graph.] (Surveying) A machine for use in making topographical maps. It is operated by being pushed across country, and not only records distances, like the perambulator, but also elevations.
Or`o*he"li*o*graph (?), n. [Gr. &?; mountain + helio- + -graph.] (Photog.) A camera for obtaining a circular panoramic view of the horizon. The photographic plate is placed horizontally with a vertical lens above. A mirror of peculiar shape reflects light from the entire horizon to the lens, by means of which it is focused upon the plate.
O*rom"e*ter (?), n. [Gr. &?; mountain + -meter.] (Meteor.) An aneroid barometer having a second scale that gives the approximate elevation above sea level of the place where the observation is made.
Or"tho*graph (?), n. [Ortho- + -graph.] (Arch.) An orthographic projection, sometimes partly in section, esp. of a building.
Os"cil*lat`ing current. (Elec.) A current alternating in direction.
Os"cil*la`tor (?), n. One that oscillates; specif.: (a) (Elec.) Any device for producing electric oscillations; esp., an apparatus for generating electric waves in a system of wireless telegraphy. (b) (Mech.) An instrument for measuring rigidity by the torsional oscillations of a weighted wire.
Os"cil*lo*gram (?), n. [L. oscillare + -gram.] (Elec.) An autographic record made by an oscillograph.
Os"cil*lo*graph (?), n. [L. oscillare to swing + -graph.] (Elec.) An apparatus for recording or indicating alternating-current wave forms or other electrical oscillations, usually consisting of a galvanometer with strong field, in which the mass of the moving part is very small and frequency of vibration very high. -- Os`cil*lo*graph"ic (#), a.
Os`cil*lom"e*ter (?), n. [L. oscillare to swing + -meter.] An instrument for measuring the angle through which a ship rolls or pitches at sea.
Os*cil"lo*scope (?), n. [L. oscillare to swing + -scope.] (Elec.) An instrument for showing visually the changes in a varying current; an oscillograph.
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Os"mo*gene (?), n. [Osmose + root of Gr. &?; race.] An apparatus, consisting of a number of cells whose sides are of parchment paper, for conducting the process of osmosis. It is used esp. in sugar refining to remove potassium salts from the molasses.
Os"mo*graph (?), n. [Osmose + -graph.] (Physics) An instrument for recording the height of the liquid in an endosmometer or for registering osmotic pressures.
||Os`te*ol"y*sis (?), n. [NL. osteo- + Gr. &?; a loosing.] Softening and absorption of bone. -- Os`te*o*lyt"ic (#), a.
Os"te*o*path (?), n. A practitioner of osteopathy.
Os`te*o*path"ic (?), a. (Med.) Of or pertaining to osteopathy. -- Os`te*o*path"ic*al*ly (#), adv.
Os`te*op"a*thist (?), n. One who practices osteopathy; an osteopath.
Os`te*op"a*thy (?), n. [Osteo- + Gr. &?; suffering.] (Med.) (a) Any disease of the bones. [R.] (b) A system of treatment based on the theory that diseases are chiefly due to deranged mechanism of the bones, nerves, blood vessels, and other tissues, and can be remedied by manipulations of these parts.
||Os`te*o*per`i*os*ti"tis (?), n. [NL.; osteo- + periosteum + -itis.] (Med.) Inflammation of a bone and its periosteum.
||Os`te*o*po*ro"sis (?), n. [NL.; osteo- + Gr. &?; pore.] (Med. & Physiol.) An absorption of bone so that the tissue becomes unusually porous.
||Os`te*o*scle*ro"sis (?), n. [NL.; osteo- + sclerosis.] Abnormal hardness and density of bone.
||Ot*ta"va ri"ma (?). [It. See Octave, and Rhyme.] (Pros.) A stanza of eight lines of heroic verse, with three rhymes, the first six lines rhyming alternately and the last two forming a couplet. It was used by Byron in "Don Juan," by Keats in "Isabella," by Shelley in "The Witch of Atlas," etc.
Ot"to cy`cle (?). (Thermodynamics) A four- stroke cycle for internal-combustion engines consisting of the following operations: First stroke, suction into cylinder of explosive charge, as of gas and air; second stroke, compression, ignition, and explosion of this charge; third stroke (the working stroke), expansion of the gases; fourth stroke, expulsion of the products of combustion from the cylinder. This is the cycle invented by Beau de Rochas in 1862 and applied by Dr. Otto in 1877 in the Otto-Crossley gas engine, the first commercially successful internal-combustion engine made.
Otto engine. An engine using the Otto cycle.
Oua`na`niche" (?), n. [Canadian F., of Amer. Indian origin.] A small landlocked variety of the Atlantic salmon (Salmo salar ounaniche) of Lake St. John, Canada, and neighboring waters, noted for its vigor and activity, and habit of leaping from the water when hooked.
Out*foot" (?), v. t. To outrun or outwalk; hence, of a vessel, to outsail. [Colloq.]
Out"pen`sion (?), v. t. To grant an outpension to.
Out"pen`sion, n. A public pension granted to one not required to live in a charitable institution. -- Out"pen`sion*er, n.
||Ou`tré" (?), a. [F., p.p. of outer to exaggerate, fr. L. ultra beyond. See Outrage.] Out of the common course or limits; extravagant; bizarre; as, an outré costume.
My first mental development had in it much of the uncommon -- even much of the outré.
E. A. Poe.
Out"rig`ger, n. (Aëronautics) A projecting frame used to support the elevator or tail planes, etc.
O`ver*cast", v. t. (Bookbinding) To fasten, as single sheets, by overcast stitching or by folding one edge over another.
O`ver*de*vel"op (?), v. t. To develop excessively; specif. (Photog.), to subject (a plate or film) too long to the developing process.
O"ver*draft` (?), n. (Banking) The act of overdrawing; also, the amount or sum overdrawn.
O`ver*ex*pose" (?), v. t. To expose excessively; specif. (Photog.), to subject (a plate or film) too long to the actinic action of the light used in producing a picture. -- O`ver*ex*po"sure (#), n.
O"ver*glaze` (?), a. (Ceramics) (a) Applied over the glaze; -- said of enamel paintings, which sometimes are seen to project from the surface of the ware. (b) Suitable for applying upon the glaze; -- said of vitrifiable colors used in ceramic decoration.
{ O"ver*head" charges, expenses, etc. } (Accounting) Those general charges or expenses in any business which cannot be charged up as belonging exclusively to any particular part of the work or product, as where different kinds of goods are made, or where there are different departments in a business; -- called also fixed, establishment, or (in a manufacturing business) administration, selling, and distribution, charges, etc.
O"ver*man (?), n.; pl. - men (&?;). 1. One in authority over others; a chief; usually, an overseer or boss.