World English Dictionary
combining form
a variant of pyro-

pyro- or (before a vowel) pyr-
combining form
1.  denoting fire, heat, or high temperature: pyromania; pyrometer
2.  caused or obtained by fire or heat: pyroelectricity
3.  chem
 a.  denoting a new substance obtained by heating another: pyroboric acid is obtained by heating boric acid
 b.  denoting an acid or salt with a water content intermediate between that of the ortho- and meta- compounds: pyro-phosphoric acid
4.  mineralogy
 a.  having a property that changes upon the application of heat: pyromorphite
 b.  having a flame-coloured appearance: pyroxylin
[from Gk pur fire]
pyr- or (before a vowel) pyr-
combining form
[from Gk pur fire]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

pyr- pref.
Variant of pyro-.

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