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diastem

[dahy-uh-stem] /ˈdaɪ əˌstɛm/
noun, Geology
1.
a minor hiatus in an orderly succession of sedimentary rocks.
Compare unconformity.
Origin
1850-1855
1850-55; < Greek diástēma interval; see diastema
Related forms
diastemic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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