(used as a copula to introduce or form interrogative or imperative sentences): Is that right? Be quiet! Don’t be facetious. auxiliaryverb, present singular 1st person am, 2nd are or (Archaic) art, 3rd is, present plural are; past singular 1st person was, 2nd were or (Archaic) wast ...
any of numerous small long-tailed rodents of the families Muridae and Cricetidae that are similar to but smaller than rats See also fieldmouse, harvest mouse, house mouse related adjective murine 2. any of various related rodents, such as the jumping mouse 3. a quiet, timid, or cowardly per...