adj.
Pronunciation: ˌ h ī -dr ə - ' th ə r-m ə l
Function: adjective
Etymology: International Scientific Vocabulary
Date: 1849
: of or relating to hot water ― used especially of the formation of minerals by hot solutions rising from a cooling magma
– hy · dro · ther · mal · ly \ -m ə -l ē \ adverb