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onlap

US:USA pronunciation: respellingUSA pronunciation: respelling(on′lap′, ôn′-)

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WordReference Random House Unabridged Dictionary of American English © 2026

on•lap (on′lap′, ôn′-),USA pronunciation n. [Geol.]

Geologythe advance of a sea beyond its former shore.
Geologythe layer or layers of sedimentary rock formed on a sea floor as a result of this advance. Cf. offlap.

on + lap³ 1945–50

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