Noun | 1. | ![]() gnawer, rodent - relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing Gerbillinae, subfamily Gerbillinae - gerbils jird - gerbil of northern Africa Meriones unguiculatus, tamarisk gerbil - a gerbil that is popular as a pet Meriones longifrons, sand rat - southern European gerbil |