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onlap

American  
[on-lap, awn-] / ˈɒnˌlæp, ˈɔn- /

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.

Etymology

Origin of onlap

First recorded in 1945–50; on + lap 3

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.