Definition of nocturnal

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< nocturn

nocturnal emission >

noc·tur·nal    (nk-tûrnl) KEY  

ADJECTIVE:

1. Of, relating to, or occurring in the night: nocturnal stillness.
2. Botany Having flowers that open during the night.
3. Zoology Most active at night: nocturnal animals.

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ETYMOLOGY:
Middle English, from Old French, from Late Latin nocturnlis, from Latin nocturnus, from nox , noct-, night; see nek^w-t- in Indo-European roots

OTHER FORMS:
noc·turnal·ly (Adverb)

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