Pyroacetic \Pyr`o*a*ce"tic\, a. [Pyro- + acetic: cf. F. pyroac['e]tique.]

(Chem.) Pertaining to, and designating, a substance (acetone) obtained by the distillation of the acetates. It is now called also pyroacetic ether, and formerly was called pyroacetic spirit.

Source: Webster's Revised Unabridged Dictionary (1913)