[es-ker] /ˈɛs kər/

noun, Geology.
a long winding ridge of gravel, sand, etc, originally deposited by a meltwater stream running under a glacier Also called os

“deposit left by a glacial stream,” 1852, from Irish eiscir “ridge of gravel.”
A long, narrow, steep-sided ridge of coarse sand and gravel deposited by a stream flowing in or under a melting sheet of glacial ice. Eskers range in height from 3 m (9.8 ft) to more than 200 m (656 ft) and in length from less than 100 m (328 ft) to more than 500 km (310 mi).


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