beaver dam

:  either of two large semiaquatic herbivorous rodents comprising a family (Castoridae including Castor canadensis of North America and C. fiber of Eurasia), having webbed hind feet and a broad flat scaly tail, and constructing dams and partially submerged lodges

:  the fur or pelt of the beaver

:  a hat made of beaver fur or a fabric imitation

:  a piece of armor protecting the lower part of the face

:  a helmet visor

:  to work energetically

:  the female parent of an animal and especially of a domestic animal

:  a body of water confined by a barrier

:  a barrier preventing the flow of water or of loose solid materials (such as soil or snow)

:  a barrier built across a watercourse for impounding (see impound 2) water

:  to provide or restrain with a barrier that prevents the flow of water :  to provide or restrain with a dam (see ²dam 2a)

:  to stop up :  block

: dekameter