omicron

[ om-i-kron, oh-mi- ]
/ ˈɒm ɪˌkrɒn, ˈoʊ mɪ- /

noun

the 15th letter of the Greek alphabet (O, o).
the vowel sound represented by this letter.

Origin of omicron

< Greek ō mikrón, literally, small o. Cf. omega
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British Dictionary definitions for omicron

omicron

/ (əʊˈmaɪkrɒn, ˈɒmɪkrɒn) /

noun

the 15th letter in the Greek alphabet (Ο, ο), a short vowel, transliterated as o

Word Origin for omicron

from Greek ō mikron small o; see micro-, omega
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for omicron

omicron

[ ŏmĭ-krŏn′, ōmĭ- ]

n.

The 15th letter of the Greek alphabet.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.