The Collaborative International Dictionary of English v.0.48:
Sudation \Su*da"tion\, n. [L. sudatio, fr. sudare to sweat: cf. F. sudation.] A sweating. [Obs.] [1913 Webster]WordNet (r) 3.0 (2006):
sudation n 1: the process of the sweat glands of the skin secreting a salty fluid; "perspiration is a homeostatic process" [syn: perspiration, sweating, diaphoresis, sudation, hidrosis]