Noun | 1. | ![]() mammal genus - a genus of mammals Cricetidae, family Cricetidae - mostly small New World rodents including New World mice and lemmings and voles and hamsters jird - gerbil of northern Africa Meriones unguiculatus, tamarisk gerbil - a gerbil that is popular as a pet Meriones longifrons, sand rat - southern European gerbil |