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authigenic

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au⋅thi⋅gen⋅ic

[aw-thi-jen-ik]
–adjective Geology.
(of a constituent of a rock) formed in the rock where it is found. Compare allogenic (def. 1).

Origin:
1885–90; < G Authigen < Gk authigens native to a specific place (aûthi there + -genēs born) + -ic; see genic
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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