NOCTURNAL
nocturnal
(adjective) belonging to or active during the night; “nocturnal animals are active at night”; “nocturnal plants have flowers that open at night and close by day”
nocturnal
(adjective) of or relating to or occurring in the night; “nocturnal darkness”
Source: WordNet® 3.1
Etymology
Adjective
nocturnal (comparative more nocturnal, superlative most nocturnal)
(of a person, creature, group, or species) Primarily active during the night.
(of an occurrence) Taking place at night, nightly.
Antonyms
• diurnal
Coordinate terms
• crepuscular
Noun
nocturnal (plural nocturnals)
A person or creature that is active at night.
(historical) A device for telling the time at night, rather like a sundial but read according to the stars.
Synonym: star clock
Source: Wiktionary
Noc*tur"nal, a. Etym: [L. nocturnalis, nocturnus, fr. nox, noctis,
night. See Night, and cf. Nocturn.]
1. Of, pertaining to, done or occuring in, the night; as, nocturnal
darkness, cries, expedition, etc.; -- opposed to Ant: diurnal.
Dryden.
2. Having a habit of seeking food or moving about at night; as,
nocturnal birds and insects.
Noc*tur"nal, n.
Definition: An instrument formerly used for taking the altitude of the
stars, etc., at sea. I. Watts.
Source: Webster’s Unabridged Dictionary 1913 Edition