omicron Hear it!

omicron definition

omi·cron (äm′i krän′, ō′mi-)

noun

the fifteenth letter of the Greek alphabet (Ο, ο)

Etymology: Gr o mikron, lit., small o: see micron, omega

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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