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on•lap



Pronunciation: (on'lap", ôn'-), [key]
n. Geol.
1. the advance of a sea beyond its former shore.
2. the layer or layers of sedimentary rock formed on a sea floor as a result of this advance. Cf. offlap.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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