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pyro- Definition

pyro- (pī′rō, -rə; pir′ō, -ə)

  1. fire, heat pyromania,pyrometer
  2. Chem.
    1. a substance derived (from a specified substance) by or as if by the action of heat pyrogallic acid
    2. an inorganic acid derived from an ortho-acid, as orthophosphoric acid, by the elimination of one molecule of water from two molecules of the acid pyrophosphoric acid
  3. Geol. a formation due to the action of heat pyroxenite

Etymology: < Gr pyr (gen. pyros), fire