Etymology
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omicron (n.)

15th letter of the Greek alphabet, c. 1400, literally "small 'o,' " from o + Greek (s)mikros "small" (see micro-). So called because the vowel was "short" in ancient Greek. Compare omega.

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Definitions of omicron

omicron (n.)
the 15th letter of the Greek alphabet;
From wordnet.princeton.edu