"passerine" in the noun sense
1. passerine, passeriform bird
perching birds mostly small and living near the ground with feet having 4 toes arranged to allow for gripping the perch most are songbirds hatchlings are helpless
"passerine" in the adjective sense
1. passerine
relating to or characteristic of the passeriform birds
Source: WordNet® (An amazing lexical database of English)
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