From WordNet (r) 3.0 (2006):
dam
n 1: a barrier constructed to contain the flow of water or to
keep out the sea [syn: dam, dike, dyke]
2: a metric unit of length equal to ten meters [syn:
decameter, dekameter, decametre, dekametre, dam,
dkm]
3: female parent of an animal especially domestic livestock
v 1: obstruct with, or as if with, a dam; "dam the gorges of the
Yangtse River" [syn: dam, dam up]