Etymology
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passerine (adj.)

"resembling or relating to a sparrow; of about the size of a sparrow," 1776, from Latin passerinus "of a sparrow," from passer "sparrow," which is of uncertain origin. The noun, "a passerine bird," is 1842, from the adjective.

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Definitions of passerine
1
passerine (n.)
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;
Synonyms: passeriform bird
2
passerine (adj.)
relating to or characteristic of the passeriform birds;
From wordnet.princeton.edu