Noun | 1. | Hydrobatidae - storm petrels bird family - a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings order Procellariiformes, Procellariiformes - petrels; albatrosses; shearwaters; diving petrels storm petrel - any of various small petrels having dark plumage with paler underparts genus Hydrobates, Hydrobates - type genus of the Hydrobatidae genus Oceanites, Oceanites - a genus of Hydrobatidae |