The Collaborative International Dictionary of English v.0.48:
handbasin \handbasin\ n. A small basin used for washing thehands; as, `wash-hand basin' is a British term. Syn: washbasin, washbowl, lavabo, wash-hand basin. [WordNet 1.5]WordNet (r) 3.0 (2006):
handbasin n 1: a basin for washing the hands (`wash-hand basin' is a British expression) [syn: washbasin, handbasin, washbowl, lavabo, wash-hand basin]