Oxycymene Ox`y·cy"mene noun [ Oxy- (b) + cymene .] (Chemistry) Hydroxy cymene. Same as Carvacrol .

Oxygen Ox"y·gen noun [ French oxygène , from Greek ............ sharp, acid + root of ............ to be born. So called because originally supposed to be an essential part of every acid .] 1. (Chemistry) A colorless, tasteless, odorless, gaseous element occurring in the free state in the atmosphere, of which it forms about 23 per cent by weight and about 21 per cent by volume, being slightly heavier than nitrogen. Symbol O. Atomic weight 15.96. » It occurs combined in immense quantities, forming eight ninths by weight of water, and probably one half by weight of the entire solid crust of the globe, being an ingredient of silica, the silicates, sulphates, carbonates, nitrates, etc. Oxygen combines with all elements (except fluorine), forming oxides, bases, oxyacid anhydrides, etc., the process in general being called oxidation , of which combustion is only an intense modification. At ordinary temperatures with most substances it is moderately active, but at higher temperatures it is one of the most violent and powerful chemical agents known. It is indispensable in respiration, and in general is the most universally active and efficient element. It may be prepared in the pure state by heating potassium chlorate. This element (called dephlogisticated air by Priestley) was named oxygen by Lavoisier because he supposed it to be a constituent of all acids. This is not so in the case of a very few acids (as hydrochloric , hydrobromic , hydric sulphide , etc.), but these do contain elements analogous to oxygen in property and action. Moreover, the fact that most elements approach the nearer to acid qualities in proportion as they are combined with more oxygen, shows the great accuracy and breadth of Lavoisier's conception of its nature. 2. Chlorine used in bleaching. [ Manufacturing name]

Oxygenate Ox"y·gen·ate transitive verb [ imperfect & past participle Oxygenated ; present participle & verbal noun Oxygenating .] [ Confer French oxygéner .] (Chemistry) To unite, or cause to combine, with oxygen; to treat with oxygen; to oxidize; as, oxygenated water (hydrogen dioxide).

Oxygenation Ox`y·gen·a"tion noun [ Confer French oxygénation .] (Chemistry) The act or process of combining or of treating with oxygen; oxidation.

Oxygenator Ox"y·gen·a`tor noun An oxidizer.

Oxygenic Ox`y·gen"ic adjective (Chemistry) Pertaining to, containing, or resembling, oxygen; producing oxygen.

Oxygenium Ox`y·ge"ni·um noun [ New Latin ] (Chemistry) The technical name of oxygen. [ R.]

Oxygenizable Ox"y·gen·i"za·ble adjective (Chemistry) Oxidizable.

Oxygenize Ox"y·gen·ize transitive verb [ imperfect & past participle Oxygenized ; p pr. & verbal noun Oxygenizing .] (Chemistry) To oxidize.

Oxygenizement Ox"y·gen·ize`ment noun Oxidation.

Oxygenous Ox·yg"e·nous adjective Oxygenic.

Oxygon Ox"y·gon noun [ Greek ............ sharp + ......... an angle: confer French oxygone .] (Geom.) A triangle having three acute angles.

Oxygonal, Oxygonial Ox·yg"o·nal, Ox`y·go"ni·al adjective Having acute angles. Barlow.

Oxyhydrogen Ox`y·hy"dro·gen adjective [ Oxy- (a) + hydrogen .] (Chemistry) Of or pertaining to a mixture of oxygen and hydrogen; as, oxyhydrogen gas. Oxyhydrogen blowpipe . (Chemistry) See Blowpipe . -- Oxyhydrogen microscope , a form of microscope arranged so as to use the light produced by burning lime or limestone under a current of oxyhydrogen gas.

Oxyhydrogen Ox`y·hy"dro·gen adjective [ Oxy- + hydrogen .] (Chemistry) Of, pertaining to, or consisting of, a mixture of oxygen and hydrogen at over 5000° F.

Oxyhydrogen light Oxyhydrogen light A light produced by the incandescence of some substances, esp. lime, in the oxyhydrogen flame. Coal gas (producing the oxygas light ), or the vapor of ether ( oxyether light ) or methylated spirit ( oxyspirit light ), may be substituted for hydrogen.

OxYhæmacyanin, Oxyhæmocyanin Ox`Y·hæm`a·cy"a·nin, Ox`y·hæm`o·cy"a·nin noun [ Oxy- (a) + hæmacyanin , hæmocyanin .] (Physiol. Chem.) See Hæmacyanin .

Oxyhæmoglobin, Oxyhemoglobin Ox`y·hæm`o·glo"bin, Ox`y·hem`o·glo"bin noun [ Oxy- (a) + hæmoglobin , hemoglobin .] (Physiol. Chem.) See Hemoglobin .

Oxymel Ox"y·mel noun [ Latin oxymeli , Greek .........; ............ acid + ......... honey.] (Medicine) A mixture of honey, water, vinegar, and spice, boiled to a sirup. Sir T. Elyot.

Oxymethylene Ox`y·meth"yl·ene noun [ Oxy- (a) + methylene .] (Chemistry) Formic aldehyde, regarded as a methylene derivative.

Oxymoron Ox`y·mo"ron noun [ New Latin , from Greek ........., from ......... pointedly foolish; ......... sharp + ......... foolish.] (Rhet.) A figure in which an epithet of a contrary signification is added to a word; e. g., cruel kindness ; laborious idleness .

Oxymuriate Ox`y·mu"ri·ate noun (Old Chem.) A salt of the supposed oxymuriatic acid; a chloride. Oxymuriate of lime , chloride of lime.

Oxymuriatic Ox`y·mu`ri·at"ic adjective [ Oxy- (a) + muriatic : confer French oxymuriatique .] (Chemistry) Pertaining to, or consisting of, oxygen and muriatic acid, that is, hydrochloric acid. [ Archaic.] Oxymuriatic acid , chlorine, formerly so called on the supposition that it was a compound of oxygen and muriatic acid. [ Obsolete]

Oxyneurine Ox`y·neu"rine noun (Chemistry) See Betaine .

Oxyntic Ox·yn"tic adjective [ Greek ............ to make acid.] (Physiol.) Acid; producing acid; -applied especially to certain glands and cells in the stomach.

Oxyopia, Oxyopy Ox`y·o"pi·a, Ox"y·o`py noun [ New Latin oxyopia , from Greek ......... sharp + ......... sight.] (Medicine) Excessive acuteness of sight.

Oxyphenic Ox`y·phe"nic adjective [ Oxy- (b) + phenol .] (Chemistry) Pertaining to, or designating, the phenol formerly called oxyphenic acid , and now oxyphenol and pyrocatechin . See Pyrocatechin .

Oxyphenol Ox`y·phe"nol noun (Chemistry) A phenol, ..............., produced by the distillation of catechin; called also oxyphenic acid , and now pyrocatechin .

Oxyphony Ox·yph"o·ny noun [ Greek ......... sharp + ............ voice.] Acuteness or shrillness of voice.

Oxyquinoline Ox`y·quin"o·line noun [ Oxy- (b) + quinoline .] (Chemistry) Hydroxy quinoline; a phenol derivative of quinoline, -- called also carbostyril .

Oxyrhyncha Ox`y·rhyn"cha noun plural [ New Latin , from Greek ............ sharp + .................. snout.] (Zoology) The maioid crabs.

Oxyrrhodine Ox·yr"rho·dine noun [ Greek ......... (sc. .........); 'oxy`s acid + ............ made of roses, ............ rose.] (Medicine) A mixture of two parts of the oil of roses with one of the vinegar of roses. Floyer.

Oxysalt Ox"y·salt noun [ Oxy- (a) + salt .] (Chemistry) A salt of an oxyacid, as a sulphate.

Oxysulphide Ox`y·sul"phide noun (Chemistry) A ternary compound of oxygen and sulphur.

Oxysulphuret Ox`y·sul"phu·ret noun (Chemistry) An oxysulphide. [ Obsolescent]

Oxytocic Ox`y·toc"ic adjective [ Greek ............ sharp, quick + ............ birth.] (Medicine) Promoting uterine contractions, or parturition. -- noun An oxytocic medicine or agent.

Oxytoluene Ox`y·tol"u·ene noun [ Oxy- (a) + toluene .] One of three hydroxy derivatives of toluene, called the cresols . See Cresol .

Oxytone Ox"y·tone adjective [ Greek .........; ......... sharp + ......... tone.] Having an acute sound; (Gr. Gram.) , having an acute accent on the last syllable.

Oxytone Ox"y·tone noun 1. An acute sound. 2. (Gr. Gram.) A word having the acute accent on the last syllable.

Oxytonical Ox`y·ton"ic·al adjective (Gr. Gram.) Oxytone.

Oyer O"yer noun [ Anglo F., a hearing, from Old French oïr , French ouïr , to hear, Latin audire . See Audible .] (Law) A hearing or an inspection, as of a deed, bond, etc., as when a defendant in court prays oyer of a writing. Blackstone. Oyer and terminer (Law) , a term used in England in commissions directed to judges of assize about to hold court, directing them to hear and determine cases brought before them. In the U.S. the phrase is used to designate certain criminal courts.

Oyez O"yez` (ōyĕs; 277) interj. [ Anglo-F. oyez hear ye. See Oyer .] Hear; attend; -- a term used by criers of courts to secure silence before making a proclamation. It is repeated three times. [ Written also oyes .]

Oylet Oy"let noun [ See Eyelet .] 1. See Eyelet . 2. (Architecture) Same as Oillet .

Oynoun Oy"noun noun Onion. [ Obsolete] Chaucer.

Oyster Oys"ter noun [ Old French oistre , French huître , Latin ostrea , ostreum , Greek 'o`streon ; probably akin to 'ostre`on bone, the oyster being so named from its shell. Confer Osseous , Ostracize .] 1. (Zoology) Any marine bivalve mollusk of the genus Ostrea. They are usually found adhering to rocks or other fixed objects in shallow water along the seacoasts, or in brackish water in the mouth of rivers. The common European oyster ( Ostrea edulis ), and the American oyster ( Ostrea Virginiana ), are the most important species. 2. A name popularly given to the delicate morsel contained in a small cavity of the bone on each side of the lower part of the back of a fowl. Fresh-water oyster (Zoology) , any species of the genus Etheria , and allied genera, found in rivers of Africa and South America. They are irregular in form, and attach themselves to rocks like oysters, but they have a pearly interior, and are allied to the fresh-water mussels. -- Oyster bed , a breeding place for oysters; a place in a tidal river or other water on or near the seashore, where oysters are deposited to grow and fatten for market. See 1st Scalp , noun -- Oyster catcher (Zoology) , any one of several species of wading birds of the genus Hæmatopus , which frequent seashores and feed upon shellfish. The European species ( H. ostralegus ), the common American species ( H. palliatus ), and the California, or black, oyster catcher ( H. Bachmani ) are the best known. -- Oyster crab (Zoology) a small crab ( Pinnotheres ostreum ) which lives as a commensal in the gill cavity of the oyster. -- Oyster dredge , a rake or small dragnet of bringing up oyster from the bottom of the sea. -- Oyster fish . ( Zoöl .) (a) The tautog. (b) The toadfish. -- Oyster plant . (Botany) (a) A plant of the genus Tragopogon ( T. porrifolius ), the root of which, when cooked, somewhat resembles the oyster in taste; salsify; -- called also vegetable oyster . (b) A plant found on the seacoast of Northern Europe, America and Asia ( Mertensia maritima ), the fresh leaves of which have a strong flavor of oysters. -- Oyster plover . (Zoology) Same as Oyster catcher , above. -- Oyster shell (Zoology) , the shell of an oyster. -- Oyster wench , Oyster wife , Oyster women , a women who deals in oysters. -- Pearl oyster . (Zoology) See under Pearl . -- Thorny oyster (Zoology) , any spiny marine shell of the genus Spondylus .

Oyster-green Oys"ter-green` noun (Botany) A green membranous seaweed ( Ulva ) often found growing on oysters but common on stones, piles, etc.

Oystering Oys"ter·ing noun Gathering, or dredging for, oysters.

Oysterling Oys"ter·ling noun (Zoology) A young oyster.

Ozena O·ze"na noun [ New Latin , from Latin ozaena , Greek 'o`zaina , from 'o`zein to smell.] (Medicine) A discharge of fetid matter from the nostril, particularly if associated with ulceration of the soft parts and disease of the bones of the nose.

Ozocerite O`zo·ce"rite noun [ Greek 'o`zein to smell + ... wax.] (Min.) A waxlike mineral resin; -- sometimes called native paraffin , and mineral wax .