Nocturn \Noc"turn\, n. [F. nocturne, fr. L. nocturnus. See
{Nocturnal}, and cf. {Nocturne}.]
1. An office of devotion, or act of religious service, by
night.
[1913 Webster]
2. One of the portions into which the Psalter was divided,
each consisting of nine psalms, designed to be used at a
night service. --Hook.
[1913 Webster]