Found 2 items, similar to night owl.
English → English (WordNet) Definition: night owl night owl n : a person who likes to be active late at night [syn: nighthawk, nightbird]
English → English (gcide) Definition: night owl nightbird \nightbird\ n. A person who likes to be active late at night; a night owl. Syn: night owl, nighthawk. [WordNet 1.5] nighthawk \nighthawk\ n. 1. A person who likes to be active late at night; a night owl . Syn: night owl, nightbird. [WordNet 1.5] 2. (Zo["o]l.) Any of several mainly nocturnal North American goatsuckers, especially Chordeiles minor, or the related European goatsucker Caprimulgus europaeus, also called the nightjar. Syn: bullbat, mosquito hawk. [WordNet 1.5] night owl \night" owl`\ n. A person who likes to be active late at night. Syn: nighthawk, nightbird. [WordNet 1.5]