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See more synonyms for interfinger on Thesaurus.com
verb (used without object) Geology.
  1. (of sedimentary rocks) to change laterally from one type to another in a zone where the two types form interpenetrating wedges.
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Origin of interfinger

First recorded in 1970–75; inter- + finger
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018