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an organic acid, C3O3N3H3, first obtained by heating uric acid or urea, and called pyrouric acid; afterwards obtained from isocyanic acid. It is a white crystalline substance, odorless and almost tasteless; -- called also tricarbimide.

Divalent; -- said of a base or radical as capable of saturating two acid monad radicals or a dibasic acid. Cf. Dibasic, a., and Biacid.

To free from acid.

Rotten from being too ripe; overripe. [Obs.] Blount.

Having six atoms or radicals capable of being replaced by acids; hexatomic; hexavalent; -- said of bases; as, mannite is a hexacid base.

An acid containing hydrogen; -- sometimes applied to distinguish acids like hydrochloric, hydrofluoric, and the like, which contain no oxygen, from the oxygen acids or oxacids. See Acid.

Having one hydrogen atom replaceable by a negative or acid atom or radical; capable of neutralizing a monobasic acid; -- said of bases, and of certain metals.

An acid elevator, as a tube through which acid is forced to some height in a sulphuric acid manufactory.

Destitute of acid properties; hence, basic; metallic; positive; -- said of certain atoms and radicals.

See Oxyacid.

An acid containing oxygen, as chloric acid or sulphuric acid; - - contrasted with the hydracids, which contain no oxygen, as hydrochloric acid. See Acid, and Hydroxy-.

Capable of neutralizing, or combining with, five molecules of a monobasic acid; having five hydrogen atoms capable of substitution by acid residues; -- said of certain complex bases.

ed; contented; unruffied; undisturbed; serene; peaceful; tranquil; quiet; gentle. "That placid aspect and meek regard." Milton. "Sleeping . . . the placid sleep of infancy." Macaulay.

The quality or state of being placid; calmness; serenity. Hawthorne.

In a placid manner.

The quality or state of being placid.

Capable of neutralizing, or of combining with, several molecules of a monobasic acid; having more than one hydrogen atom capable of being replaced by acid radicals; -- said of certain bases; as, calcium hydrate and glycerin are polyacid bases.

Of or pertaining to the parrots, or the Psittaci. -- n.

An acid obtained by sybjecting another acid to the action of heat. Cf. Pyro-.

Having a taste compounded of saltness and acidity; both salt and acid. [R.]