- Active at night - Active by night - Clan to run operation at night-time - Night loving - Of, pertaining to, done or occuring in, the night; as,
nocturnal darkness, cries, expedition, etc.; -- opposed to diurnal. - Having a habit of seeking food or moving about at night;
as, nocturnal birds and insects. - An instrument formerly used for taking the altitude of
the stars, etc., at sea.