Definition of Dam

Noun: dam dam

A barrier constructed to contain the flow of water or to keep out the sea
- dike, dyke
A metric unit of length equal to ten meters
- decameter [US], dekameter [US], decametre [Brit, Cdn], dekametre [Cdn], dkm
Female parent of an animal especially domestic livestock
(dentistry) a device to prevent a tooth from getting wet, consisting of a rubber sheet held with a band

Verb: dam (dammed,damming) dam

Obstruct with, or as if with, a dam
"dam the gorges of the Yangtse River";
- dam up