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Pertaining to, or designating, an acid found in certain lichens, and called also lecanoric acid. [Formerly written also orseillic.]

Pertaining to, or designating, an organic acid obtained by a partial decomposition of orsellic acid as a white crystalline substance, and related to protocatechuic acid.

A combining form (also used adjectively), designating:

Designating a complex ether, C.(OC2H5)4, which is obtained as a liquid of a pleasant ethereal odor by means of chlorpicrin, and is believed to be a derivative of the hypothetical normal carbonic acid, C.(OH)4.

An instrument designed to show the condition of the superficial portions of the eye.

Designating the form of silicic acid having the normal or highest number of hydroxyl groups.

Of, pertaining to, or designating, a nitrogenous acid of osmium, H2N2Os2O5, forming a well-known series of yellow salts.

Pertaining to, derived from, or containing, osmium; specifically, designating those compounds in which it has a valence higher than in other lower compounds; as, osmic oxide. Osmic acid. (Chem.) (a) Osmic tetroxide. [Obs.] (b) Osmic acid proper, an acid analogous to sulphuric acid, not known in the free state, but form…

A composition, for a full orchestra, designed as an introduction to an oratorio, opera, or ballet, or as an independent piece; -- called in the latter case a concert overture.

Pertaining to, derived from, or contained in, sorrel, or oxalis; specifically, designating an acid found in, and characteristic of, oxalis, and also certain plant of the Buckwheat family. Oxalic acid (Chem.), a dibasic acid, existing combined in oxalis as an acid potassium oxalate, and in many plant tissues as the calc…

Pertaining to, or designating, a complex nitrogenous acid related to the ureids, and obtained from parabanic acid as a white silky crystalline substance.

Pertaining to, or designating, an acid NH2.C2O2.HO obtained as a fine crystalline powder, intermediate between oxalic acid and oxamide. Its ammonium salt is obtained by boiling oxamide with ammonia.

Pertaining to, or derived from, oxalic acid and aniline; -- used to designate an acid obtained in white crystalline scales by heating these substances together.

Pertaining to, or designating, certain compounds of iodine and oxygen.

Pertaining to, or designating, a complex nitrogenous acid (C4H5N3O4) not known in the free state, but obtained, in combination with its salts, by a slow oxidation of uric acid, to which it is related.

A prefix, also used adjectively, designating:

Hydroxyacetic; designating an acid called also glycolic acid.

Hydroxybenzoic; pertaining to, or designating, any one of several hydroxyl derivatives of benzonic acid, of which the commonest is salicylic acid.

Pertaining to, or designating, certain compounds of oxygen and bromine.

Hydroxybutyric; designating any one of a group of metameric acids (C3H6.OH.CO2H).