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phosphorous

[fos-fer-uh s, fos-fawr-uh s, -fohr-] /ˈfɒs fər əs, fɒsˈfɔr əs, -ˈfoʊr-/
adjective, Chemistry
1.
containing trivalent phosphorus.
Origin
1770-1780
1770-80; phosphor- + -ous
Related forms
nonphosphorous, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for nonphosphorous

phosphorous

/ˈfɒsfərəs/
adjective
1.
of or containing phosphorus in the trivalent state
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for nonphosphorous

phosphorous

adj.

1777, "phosphorescent," from phosphorus + -ous. The chemical sense (1794) is immediately from French phosphoreux.

Online Etymology Dictionary, © 2010 Douglas Harper
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nonphosphorous in Medicine

phosphorous phos·pho·rous (fŏs'fər-əs, fŏs-fôr'əs)
adj.
Of, relating to, or containing phosphorus, especially with a valence of 3 or a valence lower than that of a comparable phosphoric compound.

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