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phreatic

[free-at-ik]
adjective Geology.
  1. noting or pertaining to ground water.
  2. noting or pertaining to explosive volcanic activity involving steam derived from ground water: a phreatic explosion.
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Origin of phreatic

1890–95; < Greek phreat- (stem of phréar) artificial well + -ic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for phreatic

phreatic

adjective
  1. geography of or relating to ground water occurring below the water tableCompare vadose
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Word Origin

C19: from Greek phrear a well
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012