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[om-i-kron, oh-mi-] /ˈɒm ɪˌkrɒn, ˈoʊ mɪ-/
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for omicron


/əʊˈmaɪkrɒn; ˈɒmɪkrɒn/
the 15th letter in the Greek alphabet (Ο, ο), a short vowel, transliterated as o
Word Origin
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
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Word Origin and History for omicron

15th letter of the Greek alphabet, literally "small 'o,' " from Greek (s)mikros "small," from PIE *smik-. Because the vowel was "short" in ancient Greek. Cf. Omega.

Online Etymology Dictionary, © 2010 Douglas Harper
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omicron in Medicine

omicron om·i·cron (ŏm'ĭ-krŏn', ō'mĭ-)

Symbol o 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.
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