antelucan [ˏænti'lu:kәn]
adj.
黎明前的
Antelucan \An`te*lu"can\, a. [L. antelucanus; ante + lux light.]
Held or being before light; -- a word applied to assemblies
of Christians, in ancient times of persecution, held before
light in the morning. ``Antelucan worship.'' --De Quincey.