from the GNU version of the Collaborative International Dictionary of English
- n. a genus of extinct beavers of the Pleistocene; of eastern and southern U.S.
from The Century Dictionary and Cyclopedia
- n. The typical genus of the family Castoroididœ.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. extinct beavers of the Pleistocene; of eastern and southern United States
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