HyperDic: boulder_clay

English > 1 sense of the expression boulder clay:
NOUNsubstanceboulder clay, tillunstratified soil deposited by a glacier
English > boulder clay: 1 sense > noun 1, substance
Meaningunstratified soil deposited by a glacier; consists of sand and clay and gravel and boulders mixed together.
Synonymtill
Broadersoil, dirtThe part of the earth's surface consisting of humus and disintegrated rock
Spanishtill

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