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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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