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diastem

[dahy-uh-stem]
noun Geology.
  1. a minor hiatus in an orderly succession of sedimentary rocks.
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Compare unconformity.

Origin of diastem

1850–55; < Greek diástēma interval; see diastema
Related formsdi·a·stem·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018