serotonin Hear it!

serotonin definition

se·ro·tonin (sir′ə tō′nin, ser′-)

noun

a complex amine, CHNO, found in blood, the brain, etc. or produced synthetically: it constricts the blood vessels and contracts smooth muscle tissue, and is important both as a neurotransmitter and a hormone

Etymology: sero- + ton(ic) + -in

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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