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Variant of pyro-.
a variant of pyro-
1. a combining form meaning “fire,” “heat,” “high temperature,” used in the formation of compound words: pyrogen; pyromancy.
2.Also, esp. before h or a vowel, pyr-.
a. a combining form used in the names of inorganic acids, the water content of which is intermediate between the ortho and meta forms of an acid: pyrophosphoric acid.
b. a combining form used in the names of the salts of these acids.
[< Greek pyro-, comb. form of pŷr fire]