sub·glacial \“+\adjective Etymology:sub- + glacial 1.: of, relating to, or formed in or by the bottommost part of a glacier or the area immediately underlying a glacier < subglacial channels > < the subglacial floor > 2.: postglacial < postglacial (or subglacial) stream-cut canyons — Journal of Geology > • sub·glacially\“+\adverb