omicron - Dictionary definition and pronunciation - Yahoo! Education
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om·i·cron  audio  (m-krn, m-) KEY 

NOUN:
The 15th letter of the Greek alphabet. See Table at alphabet.
ETYMOLOGY:
Middle English, from Greek o mkron, small o (because of its being a short vowel in Greek) : o, the letter o + mkron, neuter of mkros, small


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