Noun | 1. | Passeridae - true sparrows: Old world birds formerly considered weaverbirds bird family - a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings Oscines, Passeres, suborder Oscines, suborder Passeres - two names for the suborder of typical songbirds sparrow, true sparrow - any of several small dull-colored singing birds feeding on seeds or insects genus Passer, Passer - type genus of the Passeridae |