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retardant

[ri-tahr-dnt] /rɪˈtɑr dnt/
noun, Chemistry
1.
any substance capable of reducing the speed of a given reaction.
adjective
2.
retarding or tending to retard (usually used in combination):
fire-retardant construction materials.
Origin
1635-1645
1635-45; retard + -ant
Related forms
retardance, retardancy, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for retardance

retardant

/rɪˈtɑːdənt/
noun
1.
a substance that reduces the rate of a chemical reaction
adjective
2.
having a slowing effect
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 retardance
n.

1550s, "retardation," from Middle French retardance, from retarder (see retard (v.)). In reference to resistance to fire, 1948.

retardant

adj.

1640s, from retard (v.) + -ant or from Latin retardantem (nominative retardans), present participle of retardare. From 1952 as a noun, "retardant substance."

Online Etymology Dictionary, © 2010 Douglas Harper
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