51Թ

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onlap

[on-lap, awn-]

noun

Geology.

  1. the advance of a sea beyond its former shore.

  2. the layer or layers of sedimentary rock formed on a seafloor as a result of a sea’s advance beyond its former shore.

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51Թ History and Origins

Origin of onlap1

First recorded in 1945–50; on + lap 3

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