Nocturnal /(?)/

Noc·tur·nal

Nocturnal

a.
  1. Of, pertaining to, done or occuring in, the night; as, nocturnal darkness, cries, expedition, etc.; -- opposed to diurnal.
  2. Having a habit of seeking food or moving about at night; as, nocturnal birds and insects; raccoons are nocturnal.; -- of animals.

Nocturnal

n.
  1. An instrument formerly used for taking the altitude of the stars, etc., at sea.