dam1
n.
- a barrier constructed to hold back water and raise its level, forming a reservoir or preventing flooding.
▸a barrier of branches in a stream, constructed by a beaver to provide a deep pool and a lodge.
-
(also dental dam)
a rubber sheet used to keep saliva from the teeth during dental operations, or as a prophylactic device during cunnilingus and anilingus.
v.
(dammed, damming)
build a dam across.
▸hold back or obstruct.
Etymology
ME: from Mid. Low Ger. or MDu.; rel. to OE fordemman ‘close up’.
dam2
n.
the female parent of an animal, especially a mammal.
Etymology
ME: alt. of dame.