adjective Geology.

noting or pertaining to ground water.
noting or pertaining to explosive volcanic activity involving steam derived from ground water: a phreatic explosion.

Origin of phreatic

1890–95; < Greek phreat- (stem of phréar) artificial well + -ic Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for phreatic



geography of or relating to ground water occurring below the water tableCompare vadose

Word Origin for phreatic

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