from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to hot water.
  • adj. Geology Of or relating to hot magmatic emanations rich in water.
  • adj. Geology Of or relating to the rocks, ore deposits, and springs produced by such emanations.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. of, or relating to hot water
  • adj. of or relating to emanations of hot water that are rich in minerals, or to the rocks formed from them

from the GNU version of the Collaborative International Dictionary of English

  • adj. 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.
  • adj. of, pertaining to, or using the hot waters or steam found at special locations within the earth's crust.

from The Century Dictionary and Cyclopedia

  • Of or relating to heated water: specifically applied to the action of heated waters in producing geological changes by dissolving mineral substances and redepositing them when cooled.


from Wiktionary, Creative Commons Attribution/Share-Alike License

hydro- +‎ thermal


  • In May an arm of the Chinese government submitted plans to explore the seafloor around an underwater ridge in the Indian Ocean near Madagascar, where hot springs in the ocean bottom called hydrothermal vents have created deposits containing gold, silver, copper, nickel, cobalt, and tellurium (used in computers, CDs, and DVDs).

    Mining’s Final Frontier

  • The most likely place for it to occur, he believes, is at miniature undersea volcanoes called hydrothermal vents, where the ingredients and conditions are just right for energy-harnessing chemical machinery to develop.

    Is Life Inevitable? - The Panda's Thumb

  • Among other things, the researchers on board Dayang Yihao located rich deposits of copper, lead and zinc, associated with hot springs called hydrothermal vents that are often found near mid-ocean ridges.

    The Economist: Correspondent's diary

  • Hot springs beneath the ocean called hydrothermal vents are often teeming with alien-like life.

  • In 2009 the Japan Agency for Marine-Earth Science and Technology announced plans to send robotic submarines to study areas near seabed volcanoes, where so-called hydrothermal vents belch out minerals.

    News24 Top Stories

  • Jefferson Tester patented a drilling technology called hydrothermal spallation.

    t r u t h o u t

  • Nevada and large competitors such as Ormat and Enel operate so-called hydrothermal plants, which extract hot water from the Earth's crust in order to turn hydroelectric turbines.

    The Globe and Mail - Home RSS feed

  • It is not contended that the effect of the internal fires had no influence on the formation of metalliferous veins, indeed, it is certain that they had, but the action was what is termed hydrothermal (hot water); and such action we may see in progress to-day in New Zealand, where hot springs stream or spout above the surface, when the silica and lime impregnated water, reduced in heat and released from pressure, begins forthwith to deposit the minerals previously held in solution.

    Getting Gold: a practical treatise for prospectors, miners and students

  • Some signs suggest that whale-fall ecosystems have exchanges with other deep-seafloor communities, such as hydrothermal vents.

    Scientific American

  • However, we have found organisms living in very hostile environments, such as hydrothermal vents deep in the earth's ocean.

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