noc·tur·nal /nɑkˈtɝnḷ/
 (a.)夜的,夜曲的
 noc·tur·nal /nɑkˈtɝnḷ/ 形容詞
 (拉nocturnalis)夜間的,夜出的
 Noc·tur·nal 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.
 Noc·tur·nal, n. An instrument formerly used for taking the altitude of the stars, etc., at sea.
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 nocturnal
      adj 1: 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" [ant: diurnal]
      2: of or relating to or occurring in the night; "nocturnal
         darkness"
      3: of or during or relating to the night; "a nocturnal
         journey"; "nocturnal stillness"; "nocturnal predators"