beaver
 US /ˈbiː.vɚ/
 UK /ˈbiː.vɚ/

1. 
a large, semi-aquatic rodent native to the Northern Hemisphere, known for building dams and lodges from trees and mud
:
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The beaver gnawed down the tree to build its dam.
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We saw a family of beavers swimming in the pond.
2. 
the fur of a beaver
:
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She wore a hat made of soft beaver.
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The trapper sold the valuable beaver pelts.