esker

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1. a serpentine ridge of gravelly and sandy drift, believed to have been formed by streams under or in glacial ice.

noun

1. a long winding ridge of gravel, sand, etc, originally deposited by a meltwater stream running under a glacierAlso called: os

n.

“deposit left by a glacial stream,” 1852, from Irish eiscir “ridge of gravel.”

1. 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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