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omicron

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noun om·i·cron \ˈä-mə-ˌkrän, ˈō-, British ō-ˈmī-(ˌ)krän\

Definition of omicron

  1. :  the 15th letter of the Greek alphabet — see alphabet table

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Origin and Etymology of omicron

Middle English, from Greek o mikron, literally, small o

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