• WordNet 3.6
    • adj phreatic of or relating to ground water
    • ***
Webster's Revised Unabridged Dictionary
    • a Phreatic (Geol) Subterranean; -- applied to sources supplying wells.
    • ***
Century Dictionary and Cyclopedia
    • phreatic Subterranean, as the sources of wells.
    • ***


Webster's Revised Unabridged Dictionary
F. phréatique, from Gr. , , a well


In news:

In general, magma 's interaction with water comes in two flavors — phreatic, where the eruption is steam-driven, but no magma is directly involved, just heat, and phreatomagmatic, where magma is involved directly in the eruption.