noun, plural pyros. Informal.
a pyromaniac.

by shortening; cf. -o Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

comb. form meaning "fire," from Gk. pyro-, combining form of pyr (gen. pyros) "fire" (see pyre).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pyro- or pyr-

  1. Fire; heat: pyrophobia.

  2. Relating to the action of fire or heat: pyrolysis.

  3. Fever: pyrogen.

  4. Derived from an acid by the loss of a water molecule: pyrophosphoric acid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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