nocturnal

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

1. belonging to or active during the night (Freq. 1)
- nocturnal animals are active at night
- nocturnal plants have flowers that open at night and close by day
• Ant:
diurnal
• Topics:
biology, biological science
2. of or relating to or occurring in the night
- nocturnal darkness
• Pertains to noun:
night