The Collaborative International Dictionary
Pyroacetic
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.
Wiktionary
pyroacetic
a. (context obsolete chemistry English) of or relating to acetone (once obtained by heating acetates)