hy·dro·ther·mal

[hahy-druh-thur-muhl]
adjective Geology.
noting or pertaining to the action of hot, aqueous solutions or gases within or on the surface of the earth.

Origin:
1840–50; hydro-1 + thermal

hy·dro·ther·mal·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
hydrothermal (ˌhaɪdrəʊˈθɜːməl) [Click for IPA pronunciation guide]
 
adj
of or relating to the action of water under conditions of high temperature, esp in forming rocks and minerals
 
hydro'thermally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Hydrothermal is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
American Heritage
Science Dictionary
hydrothermal   (hī'drə-thûr'məl)  Pronunciation Key 
Relating to or produced by hot water, especially water heated underground by the Earth's internal heat. ◇ Hydrothermal energy is power that is generated using the Earth's hot water.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Hydrothermal vents on the planet's seafloor may infuse the alien ocean with
  chemical energy sources.
Hydrothermal vents are geysers located on the ocean floor in the deep sea.
Some signs suggest that whale-fall ecosystems have exchanges with other
  deep-seafloor communities, such as hydrothermal vents.
They've adapted to thrive at the edge of hydrothermal vents, which spew
  superheated water saturated with toxic chemicals.
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