retardance

 [ri-tahr-dnt]  

re·tard·ant

   [ri-tahr-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.

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Retardance is always a great word to know.
So is callithumpian. Does it mean:
a fool or simpleton; ninny.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
Origin:
1635–45; retard + -ant

Related forms
re·tard·ance, re·tard·an·cy, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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