Relating to or occurring within the interior of a glacier or ice mass.
From en- (within) + glacial (from French glacial, from Latin glacies meaning ice). The term was created by glaciologists to describe features inside glaciers.
Glaciologists distinguish between 'englacial' (inside), 'subglacial' (underneath), and 'supraglacial' (on top)—it's a perfect example of how scientists use prefixes to precisely describe where things are in ice sheets!
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