hyperhidrosis

hyperhidrosis \hahy-per-hi-DROH-sis\, noun:

abnormally excessive sweating.

"I have hyperhidrosis," Tinkle said. "What's hyperhidrosis?" I asked. "I sweat too much." "Were you actually diagnosed by a doctor?" "Yes." "How do you get hyperhidrosis?" "Genetics. And stress. Stress sets up the genetics."
-- Jonathan Ames, Wake Up, Sir!, 2004

Outside the Riviera, where the air is hot enough to give me hyperhidrosis, everyone gives the driver a two or three dollar tip.
-- William T. Vollmann, Thirteen Stories and Thirteen Epitaphs, 1991

Hyperhidrosis comes directly from the Greek meaning "excessive sweating." It entered English in the late 1800s.