pyr-

pref.

Variant of pyro-.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

pyr-

combining form

a variant of pyro-

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

pyro-

1. a combining form meaning “fire,” “heat,” “high temperature,” used in the formation of compound words: pyrogen; pyromancy.

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.

Also, esp. before h or a vowel, pyr-.

[< Greek pyro-, comb. form of pŷr fire]

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References in periodicals archive ?

Yellow viscous oil, yield40%, [x]D20 - 49.1 (c 1.14, CH3OH); 1H NMR (400 MHz, CD3OD): and 1.50-1.58 (m, 4H, CH2),1.84-2.16 (m, 10H, CH2), 2.35 (s, 6H, N-CH3), 2.42-2.52 (m, 2H, Pro-CH2), 2.58-2.67 (q, 2H, J 9.2 Hz,Pro-N-CH2), 3.38 (t, 2H, J 8.2 Hz, Pro-N-CH2),3.78 (t, 2H, J 8.2 Hz, Pro-N-CH), 4.72 (t, 4H, J 5.8 Hz, Pyr- N-CH2), 8.12 (t, 2H, J 6.2 Hz, Pyr),8.64 (d, 2H, J 8.2 Hz, Pyr), 9.03 (d, 2H, J 5.8 Hz,Pyr), 9.17 (s, 2H, Pyr) ppm; FTIR (atr): 3033,2935, 2859, 2788, 1629, 1500, 1456, 1373, 1344,1151 cm-1.

Investigation of Proline Amides and Pyridinium Salts as Catalyst for Direct Aldol Reactions in Water