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The Collaborative International Dictionary
Subglacial

Subglacial \Sub*gla"cial\, a. Pertaining or belonging to the under side of a glacier; being beneath a glacier; as, subglacial streams.

Wiktionary
subglacial

a. Formed, or occurring beneath a glacier or other body of ice

Wikipedia

Usage examples of "subglacial".

This action is particularly interesting, for the reason that in regions whence glaciers have disappeared the deposits formed in the old ice arches often afford singularly perfect moulds of those caverns which were produced by the ancient subglacial streams.

It meshed perfectly with the ancient global maps I had studied—maps which accurately depicted the subglacial topography of the continent of Antarctica (see Part I).