butyrin

[byoo-ter-in]

noun Chemistry.

a colorless, liquid ester present in butter, formed from glycerin and butyric acid.

Origin:
1820–30; butyr(ic) + (glycer)in

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Butyrin is always a great word to know.

So is elective. Does it mean:

noting compounds that readily decompose or change into other compounds

selecting for combination or action; tending to combine with certain substances in preference to others, such as elective attraction

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Collins

World English Dictionary

butyrin (ˈbjuːtɪrɪn)

—n
	a colourless liquid ester or oil found in butter. It is formed from butyric acid and glycerine

[C20: from butyr(ic acid + glycer)in(e)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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butyrin

bu·tyr·in