Osmious acid (Chem.), an acid derived from osmium, analogous to sulphurous acid, and forming unstable salts. It is a brown amorphous substance.

(Os"mite) n. (Chem.) A salt of osmious acid.

(Os"mi*um) n. [Gr. a smell, odor, akin to to smell. So named in allusion to the strong chlorinelike odor of osmic tetroxide. See Odor.] (Chem.) A rare metallic element of the platinum group, found native as an alloy in platinum ore, and in iridosmine. It is a hard, infusible, bluish or grayish white metal, and the heaviest substance known. Its tetroxide is used in histological experiments to stain tissues. Symbol Os. Atomic weight 191.1. Specific gravity 22.477.

(Os*mom"e*ter) n. [Gr. impulse + -meter.] (Physics) An instrument for measuring the amount of osmotic action in different liquids.

(Os*mom"e*try) n. (Physics) The study of osmose by means of the osmometer.

(Os"mose) n. [Gr. equiv. to impulse, fr. to push.] (Chemical Physics) (a) The tendency in fluids to mix, or become equably diffused, when in contact. It was first observed between fluids of differing densities, and as taking place through a membrane or an intervening porous structure. The more rapid flow from the thinner to the thicker fluid was then called endosmose, and the opposite, slower current, exosmose. Both are, however, results of the same force. Osmose may be regarded as a form of molecular attraction, allied to that of adhesion. (b) The action produced by this tendency.

Electric osmose, or Electric endosmose(Elec.), the transportation of a liquid through a porous septum by the action of an electric current.

(Os*mo"sis) n. [NL.] Osmose.

(Os*mot"ic) a. Pertaining to, or having the property of, osmose; as, osmotic force.

(Os"mund) n. (Bot.) A fern of the genus Osmunda, or flowering fern. The most remarkable species is the osmund royal, or royal fern which grows in wet or boggy places, and has large bipinnate fronds, often with a panicle of capsules at the top. The rootstock contains much starch, and has been used in stiffening linen.

(Os"na*burg) n. A species of coarse linen, originally made in Osnaburg, Germany.

(O"so-ber`ry) n. (Bot.) The small, blueblack, drupelike fruit of the Nuttallia cerasiformis, a shrub of Oregon and California, belonging to the Cherry tribe of Rosaceæ.

(||Os*phra"di*um) n.; pl. Osphradia [NL., fr. Gr. strong scent, fr. to smell.] (Zoöl.) The olfactory organ of some Mollusca. It is connected with the organ of respiration.

(Os"prey, Os"pray) n. [Through OF. fr. L. ossifraga (orig., the bone breaker); prob. influenced by oripelargus (mountain stork, a kind of eagle, Gr. ); cf. OF. orpres, and F. orfraie. See Ossifrage.] (Zoöl.) The fishhawk.

(Oss) v. i. [See Osse, n.] To prophesy; to presage. [R. & Obs.] R. Edgeworth.

(Osse) n. A prophetic or ominous utterance. [R. & Obs.] Holland.

Osmidrosis to Osteosarcoma

(||Os`mi*dro"sis) n. [NL., from Gr. smell + to sweat.] (Med.) The secretion of fetid sweat.

(Os"mi*ous) a. (Chem.) Denoting those compounds of osmium in which the element has a valence relatively lower than in the osmic compounds; as, osmious chloride. [Written also osmous.]

  By PanEris using Melati.

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