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WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

omicron

Noun

o=mi=cron

WORDNET DICTIONARY

is a kind of alphabetic character, letter, letter of the alphabet

omicron, n. [NL., fr. Gr. Micro-.].

Lit., the little, or short, O, o; the fifteenth letter of the Greek alphabet. [Webster 1913 Suppl.]

omicron, n. the fifteenth letter of the Greek alphabet (O).

Etymology

Gk, o mikron = small o

For further exploring for "omicron" in Webster Dictionary Online