a stone slab supported over the surface of a mountain glacier by a column or columns of ice.
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British Dictionary definitions for glacier table
a rock sitting on a pillar of ice on top of a glacier, as a result of the ice immediately beneath the rock being protected from the heat of the sun and not melting
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