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Molecule :: Molecule (n.) A group of atoms so united and combined by chemical affinity that they form a complete, integrated whole, being the smallest portion of any particular compound that can exist in a free state; as, a molecule of water consists of two atoms of hydrogen and one of oxygen. Cf. Atom..

Perchloric :: Perchloric (a.) Pertaining to, or designating, the highest oxygen acid (HClO4), of chlorine; -- called also hyperchloric..

Aerate :: Aerate (v. t.) To expose to the chemical action of air; to oxygenate (the blood) by respiration; to arterialize.

Metalloid :: Metalloid (n.) Now, one of several elementary substances which in the free state are unlike metals, and whose compounds possess or produce acid, rather than basic, properties; a nonmetal; as, boron, carbon, phosphorus, nitrogen, oxygen, sulphur, chlorine, bromine, etc., are metalloids..

Carboxide :: Carboxide (n.) A compound of carbon and oxygen, as carbonyl, with some element or radical; as, potassium carboxide..

Protoxide :: Protoxide (n.) That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b)..

Unisilicate :: Unisilicate (n.) A salt of orthosilicic acid, H4SiO4; -- so called because the ratio of the oxygen atoms united to the basic metals and silicon respectively is 1:1; for example, Mg2SiO4 or 2MgO.SiO2..

Calcium :: Calcium (n.) An elementary substance; a metal which combined with oxygen forms lime. It is of a pale yellow color, tenacious, and malleable. It is a member of the alkaline earth group of elements. Atomic weight 40. Symbol Ca..

Gas :: Gas (n.) An aeriform fluid; -- a term used at first by chemists as synonymous with air, but since restricted to fluids supposed to be permanently elastic, as oxygen, hydrogen, etc., in distinction from vapors, as steam, which become liquid on a reduction of temperature. In present usage, since all of the supposed permanent gases have been liquified by cold and pressure, the term has resumed nearly its original signification, and is applied to any substance in the elastic or aeriform state..

Subpeduncular :: Suboxide (n.) An oxide containing a relatively small amount of oxygen, and less than the normal proportion; as, potassium suboxide, K4O..

Hydrate :: Hydrate (n.) A substance which does not contain water as such, but has its constituents (hydrogen, oxygen, hydroxyl) so arranged that water may be eliminated; hence, a derivative of, or compound with, hydroxyl; hydroxide; as, ethyl hydrate, or common alcohol; calcium hydrate, or slaked lime..

Deoxidizer :: Deoxidizer (n.) That which removes oxygen; hence, a reducing agent; as, nascent hydrogen is a deoxidizer..

Monoxide :: Monoxide (n.) An oxide containing one atom of oxygen in each molecule; as, barium monoxide..

Oxycalcium :: Oxycalcium (a.) Of or pertaining to oxygen and calcium; as, the oxycalcium light. See Drummond light..

Arterialization :: Arterialization (n.) The process of converting venous blood into arterial blood during its passage through the lungs, oxygen being absorbed and carbonic acid evolved; -- called also aeration and hematosis..

Acetone :: Acetone (n.) A volatile liquid consisting of three parts of carbon, six of hydrogen, and one of oxygen; pyroacetic spirit, -- obtained by the distillation of certain acetates, or by the destructive distillation of citric acid, starch, sugar, or gum, with quicklime..

Sulphydric :: Sulphydrate (n.) A compound, analogous to a hydrate, regarded as a salt of sulphydric acid, or as a derivative of hydrogen sulphide in which one half of the hydrogen is replaced by a base (as potassium sulphydrate, KSH), or as a hydrate in which the oxygen has been wholly or partially replaced by sulphur..

Pentoxide :: Pentoxide (n.) An oxide containing five atoms of oxygen in each molecule; as, phosphorus pentoxide, P2O5..

Ester :: Ester (n.) An ethereal salt, or compound ether, consisting of an organic radical united with the residue of any oxygen acid, organic or inorganic; thus the natural fats are esters of glycerin and the fatty acids, oleic, etc..

Aerobies :: Aerobies (n. pl.) Microorganisms which live in contact with the air and need oxygen for their growth; as the microbacteria which form on the surface of putrefactive fluids.

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