hydrothermal

• POS: Adjective
• HYPHEN: hy=dro=ther=mal

CIDE DICTIONARY

hydrothermal, a. [Hydro-, 1 + thermal.].

•  Of or pertaining to hot water; -- used esp. with reference to the action of heated waters in dissolving, redepositing, and otherwise producing mineral changes within the crust of the globe.  [1913 Webster]
•  of, pertaining to, or using the hot waters or steam found at special locations within the earth's crust; as, hydrothermal power generation.  [PJC]

OXFORD DICTIONARY

hydrothermal, adj. of the action of heated water on the earth's crust.

Derivative

hydrothermally adv.