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a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust

a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust

Chlorine used in bleaching.

Chlorine used in bleaching.

An element with atomic symbol O, atomic number 8, and atomic weight 16. It is the most abundant element on earth and essential for respiration.

A colorless, odorless, tasteless gas, which forms one-fifth by volume of the atmosphere.

Oxygenium (U.S.), a gaseous element, symbol O, atomic weight 16, the most abundant and widely distributed of all the chemical elements; it combines with most of the other elements to form oxides, and is essential to animal and plant life. Oxygen is employed by inhalation in pneumonia, in dyspnea and cyanosis, and is sometimes given to athletes before a contest with the idea that it increases the "wind" and the staying powers.

Gas in the atmosphere essential to life; used to advantage in diseases of the lungs.

A gas without taste, color, or smell, forming part of the air, water, etc., and supporting life and combustion.

An elementary gas, which forms part of the air, and supports life and combustion.

A gaseous element, necessary to combustion and to animal life, existing in both the air and water.

A colourless, inodorous, tasteless gas, constituting one fifth of the atmosphere, and the supporter of life and ordinary combustion.

I engender,' that is, generator of acids; and such it was believed to be, exclusively, at the period when the name was given to it. This is now known not to be the case. Oxygen is largely distributed in nature. It exists in the air, in water, in several acids, in all the oxyds, and in vegetable and animal substances, &c. It is obtained by decomposing the peroxyd of manganese of the chlorate of potassa by heat in close vessels. Although oxygen, in the state of admixture in which it is found in the atmosphere, is of vital importance, it cannot be respired in a pure state with impunity. Animals die in it long before the whole of the oxygen is consumed. The properties of oxygen seem to be stimulant. It increases the force and velocity of the pulse, and has, accordingly, been used in cases of chronic debility, chlorosis, asthma, scrofula, dropsy, paralysis, &c. It requires to be diluted with from 10 to 20 parts of atmospheric air; one to two quarts being given during the day.

A gaseous element existing free in the air.

A non-metallic element discovered by Priestley in 1774, and termed by him dephlogisticated air, its present name being given to it by Lavoisier in 1778. It is a colorless, tasteless, and odorless gas, of a sp. gr. of 1.105 as compared with that of air, and soluble in water, which takes up about 4 per cent, of it by volume. Atomic weight, 16.00; symbol, O. Under the combined influence of a very low temperature (- 130 C.) and great pressure (475 atmospheres, or about 3 1/2 tons to the square inch) o. is liquefied. Under certain conditions it is converted into ozone. It is used therapeutically by inhalation in bronchitis and pneumonia where there is deficient aeration in consequence of heart distention, in resuscitating persons asphyxiated by coal gas, in chloroform or ether narcosis, and to relieve dyspnea in phthisis and diabetic coma. The saturated water is used for gastric or intestinal indigestion, nausea, and gastric or neuralgic headache, [Gr.]

n. [Greek] A gaseous element possessing strong chemical affinities. Its combination with bodies, when rapid, produces combustion, and in slower form, oxidation. It serves to support life, and forms about twenty-two per cent. Of the atmosphere. By composition with hydrogen it forms water.

n. [Greek] A triangle having three acute angles.