1) Alphabetic character 2) Certain fraternity chapter 3) Circular letter 4) Frat letter 5) Greek for little O 6) Greek letter 7) Greek letter 8) Head of Olympus 9) Hoi polloi character 10) It comes before pi 11) Letter 12) Letter after xi 13) Letter of the alphabet 14) Pi preceder 15) Xi follower
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https://www.crosswordclues.com/clue/omicron
Omicron (uppercase Ο, lowercase ο, literally `small o`: Όμικρον, o mikron, micron meaning `small` in contrast to omega) is the 15th letter of the Greek alphabet. In the system of Greek numerals it has a value of 70. It is rarely used in mathematics because it is indistinguishable from the Latin letters O, o and easily confused with th...
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http://en.wikipedia.org/wiki/Omicron
[wasp] Omicron is a quite diverse neotropical genus of small potter wasps. ...
Found on
http://en.wikipedia.org/wiki/Omicron_(wasp)
• (n.) Lit., the little, or short, O, o; the fifteenth letter of the Greek alphabet.
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http://thinkexist.com/dictionary/meaning/omicron/
O·mi'cron noun [ Written also
omikron .] [ New Latin , from Greek Ο ο. See
Micro- .] Lit., the little, or short, O, o; the fifteenth letter of the Greek alphabet.
Found on
http://www.encyclo.co.uk/webster/O/18
[
n] - the 15th letter of the Greek alphabet
Found on
http://www.webdictionary.co.uk/definition.php?query=omicron
omicron The 15th letter of the Greek alphabet, represented in the English alphabet as 'o'. Etymology: Middle English, from Greek o mikron, small 'o' (because of its being a short vowel in Greek).
Found on
http://www.wordinfo.info/words/index/info/view_unit/1468/
noun the 15th letter of the Greek alphabet
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.
