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A rodent of the genus Rattus (family Muridae), involved in the spread of some diseases, including bubonic plague.
a. Any of various long-tailed rodents resembling mice but larger, especially one of the genus Rattus.
b. Any of various animals similar to one of these long-tailed rodents.
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ratInfectious disease A rodent, genus Rattus, which is a vector and/or reservoir of disease–eg, Bunyaviridae, black plague, rat-bite fever Vox populi A dishonorable person. See Lab rat, Weasel.
A rodent of the genus Rattus, a widespread predator and pest that attacks wild and domestic animals, consumes or damages crops and stored foodstuffs, and is involved in transmission of diseases (e.g., intestinal parasites, plague, typhus, rat-bite fever) to humans; laboratory rats belong to albino strains of the Norway rat, R. norvegicus.