hydrothermal adjective. [hʌɪdrǝ(ʊ)'Ɵǝ:m(ǝ)l] M19.
[from HYDRO- + Greek thermos hot + -AL¹.]
Of, produced by, or designating naturally hot underground water that has geological effects.
hydrothermal vent an opening in the sea floor out of which comes hot or warm water.
■ F. H. Pough Hydrothermal solutions, from which so many minerals are deposited.

■ hydrothermally adverb by hydrothermal action M20.

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