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onlap

[on-lap, awn-]

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.

Compare offlap.

Origin of onlap

First recorded in 1945–50; on + lap³

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019