Noun | 1. | ![]() bird family - a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings order Sphenisciformes, Sphenisciformes - penguins penguin - short-legged flightless birds of cold southern especially Antarctic regions having webbed feet and wings modified as flippers genus Pygoscelis, Pygoscelis - a genus of Spheniscidae Aptenodytes, genus Aptenodytes - large penguins genus Spheniscus, Spheniscus - type genus of the Spheniscidae: jackass penguins Eudyptes, genus Eudyptes - rock hoppers |