[pyr-] or pyro- comb form [ME, fr. MF, fr. LL, fr. Gk, fr. pyr--more at fire] 1: fire: heat "pyrometer" "pyrheliometer"
2. a: produced by or as if by the action of heat "pyroelectricity" b: derived from a corresponding ortho acid by loss usu. of one molecule of water from two molecules of acid "pyrophosphoric acid"
3: fever "pyrogenic"