1 definition found From The Collaborative International Dictionary of English v.0.44 [gcide]: Pyro- \Pyro-\, Pyr- \Pyr-\ . [Gr. ?, ?, fire.] Combining forms designating fire or heat; specifically (Chem.), used to imply an actual or theoretical derivative by the action of heat; as in pyrophosphoric, pyrosulphuric, pyrotartaric, pyrotungstic, etc.

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