sar·in (sâr'ĭn)
n.
A poisonous liquid, C₄H₁₀FO₂P, that inhibits the activity of cholinesterase and is used as a nerve gas in chemical warfare.

[German, originally a code name.]

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The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.

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