Nocturnal

Part of speech: noun (n.)

An instrument formerly used for taking the altitude of the stars, etc., at sea. I. Watts.

Part of speech: adjective (a.)

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.