Definition of antelucan in US English:

antelucan

(also antilucan)

adjective

  • Of, belonging to, or occurring in the hours just before dawn.

Origin

Early 17th century; earliest use found in George Benson (?1569–1648). From classical Latin antelūcānus (also antilūcānus) of, belonging to, or occurring in the hours just before dawn from ante- + lūc-, lūx light + -ānus.

Pronunciation

antelucan

/ˌantɪˈluːk(ə)n/