Castor fiber yana nufin sunan kimiyya na Eurasian beaver, wanda shine babban nau'in rodents na ruwa mai ruwa, wanda ya kasance a Turai da Asiya. Kalmar "castor" ta fito ne daga kalmar Latin don "bever" kuma "fiber" na nufin "fibrous," yana nufin halayen beaver, mai kauri mai kauri.
