The Collaborative International Dictionary of English v.0.48:
Bather \Bath"er\ (b[=a][th]"[~e]r), n. One who bathes. [1913 Webster]WordNet (r) 3.0 (2006):
bather n 1: a person who travels through the water by swimming; "he is not a good swimmer" [syn: swimmer, natator, bather] 2: a person who takes a bath