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[pahy-roh] /ˈpaɪ roʊ/

noun, plural pyros. Informal.
a pyromaniac.
a combining form meaning “fire,” “heat,” “high temperature,” used in the formation of compound words:
pyrogen; pyrolusite; pyromancy.
Chemistry. a combining form used in the names of inorganic acids, indicating that the acid’s water content is intermediate between that of the corresponding ortho- (more water) and meta- (least water) acids (pyroantimonic, H 4 Sb 2 O 7 , pyroarsenic, H 4 As 2 O 7 , and pyrosulfuric, H 2 S 2 O 7 , acids). The combining form is also used in the names of the salts of these acids. If the acid ends in -ic, the corresponding salt ends in -ate (pyroboric acid, H 2 B 4 O 7 , and potassium pyrobate, K 2 B 4 O 7 , or pyrosulfuric, H 2 S 2 O 7 , and pyrosulfate, N 2 S 2 O 7); if the acid ends in -ous, the corresponding salt ends in -ite (pyrophosphorous acid, H 4 P 2 O 5 , potassium pyrophosphite, K 4 P 2 O 5).
combining form
denoting fire, heat, or high temperature: pyromania, pyrometer
caused or obtained by fire or heat: pyroelectricity


before vowels pyr-, word-forming element form meaning “fire,” from Greek pyro-, combining form of pyr (genitive pyros) “fire, funeral fire,” also symbolic of terrible things, rages, “rarely as an image of warmth and comfort” [Liddell & Scott]; see fire (n.). Pyriphlegethon, literally “fire-blazing,” was one of the rivers of Hell.

pyro- or pyr-


A pyromaniac, lover of fire (1977+)


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    [pahy-ruh-kem-i-kuh l] /ˌpaɪ rəˈkɛm ɪ kəl/ adjective 1. pertaining to or producing change at high temperatures. /ˌpaɪrəʊˈkɛmɪkəl/ adjective 1. of, concerned with, being, producing, or resulting from chemical changes at high temperatures pyrochemical (pī’rō-kěm’ĭ-kəl) Relating to or designating chemical activity at elevated temperatures. Pyrochemical reactions are used, for example, to bring about the transmutation of […]

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