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  1. hydrothermal vent

    • n.
      an opening in the sea floor out of which heated mineral-rich water flows.
    • noun: hydrothermal vent, plural noun: hydrothermal vents

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    • IPA[ˌhīdrōˈTHərməl vent]
    • n.
      an opening in the sea floor out of which heated mineral-rich water flows.

    Oxford American Dictionary