The building blocks of English

Affixes

hidro-

Sweat.

Greek hidrōs, sweat.

Hidrosis is the medical term for sweating, but it more commonly occurs in compounds relating to abnormal medical conditions: hyperhidrosis (Greek huper, over, beyond), excessive sweating, and anhidrosis (Greek an‑, not or without), inadequate sweating; a hidrocystoma is a benign cyst containing fluid.