The Collaborative International Dictionary of English v.0.48:
Hidrosis \Hi*dro"sis\, n. [Written also, but incorrectly, idrosis.] [NL., fr. Gr. ? to sweat, ? sweat.] 1. (Physiol.) Excretion of sweat; perspiration. [Webster 1913 Suppl.] 2. (Med.) Excessive perspiration; also, any skin disease characterized by abnormal perspiration. [Webster 1913 Suppl.]