omicron

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om·i·cron

 (ŏm′ĭ-krŏn′, ō′mĭ-)
n.
The 15th letter of the Greek alphabet. See Table at alphabet.

[Middle English, from Greek o mīkron, small o (because of its being a short vowel in Greek) : o, the letter o + mīkron, neuter of mīkros, small.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

omicron

(əʊˈmaɪkrɒn; ˈɒmɪkrɒn)
n
(Letters of the Alphabet (Foreign)) the 15th letter in the Greek alphabet (Ο, ο), a short vowel, transliterated as o
[from Greek ō mikron small o; see micro-, omega]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

om•i•cron

(ˈɒm ɪˌkrɒn, ˈoʊ mɪ-)

n.
the 15th letter of the Greek alphabet (Ο, ο).
[1450–1500; < Greek ō mikrón. literally, small o. compare omega]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.omicron - the 15th letter of the Greek alphabet
Greek alphabet - the alphabet used by ancient Greeks
alphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; "his grandmother taught him his letters"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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