Meaning of phreatic

phre•at•ic

Pronunciation: (frē-at'ik), [key]
— adj. Geol.
  1. noting or pertaining to ground water.
  2. noting or pertaining to explosive volcanic activity involving steam derived from ground water: a phreatic explosion.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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