{ 
Pyro-
, Pyr- 
}. 
[Gr. [GREEK], [GREEK], 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.