Dictionary.com
Thesaurus.com

thermal vent

American  

noun

plural

thermal vents
  1. Geology, Oceanography. an opening in the Earth, especially on the floor of the sea, from which hot, mineral-rich solutions are released.


thermal vent Scientific  
  1. An opening in the Earth, especially on the ocean floor, that emits hot water and dissolved minerals.

  2. See more at hydrothermal vent