A'quā, n.

n. [Lat., akin to Skr. ap, f., water, Goth. ahwa, river, O. H. Ger. aha, M. H. Ger. ahe, A-S. ea.] Water;—a word much used in pharmacy and the old chemistry, in various significations, determined by the word or words annexed.

Aqua fortis (Chem.), same as nitric-acid.—Aqua marine, or aqua marina, a fine variety of beryl;—formerly so called by jewelers on account of its color, resembling the green of sea-water.—Aqua regia (Chem.), the same as nitro-chloro-hydric acid.