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onlap

[ on-lap, awn- ]
/ ˈɒnˌlæp, ˈɔn- /
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noun Geology.
the advance of a sea beyond its former shore.
the layer or layers of sedimentary rock formed on a sea floor as a result of this advance.
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Origin of onlap

First recorded in 1945–50; on + lap3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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