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DictionaryomicronGreek letter
noun

omicron

AH-muh-krahn/ˈɑːməkrɑːn/

The fifteenth letter of the Greek alphabet.

Omicron comes between xi and pi in the Greek alphabet.

A compact Greek-alphabet teaching rack with five consecutive letter tiles, numbered 13–17.
Etymology
oGreekthe vowel o
+micronGreeksmall

The name means “small o,” referring to the vowel’s short duration in ancient Greek. It contrasts with omega, “big o,” which represented a long vowel.

In context

Greek For All0:42
Omicron is short and Omega is long
Omicron vs Omega

More examples

  • The lowercase omicron resembles a small o.
  • He confuses omicron with omega on the first quiz.
  • The inscription contains three clear omicrons.

Forms

omicron · omicrons