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acritarch

[ak-ri-tahrk] /ˈæk rɪˌtɑrk/
noun, Paleontology
1.
any of various microfossils, of unknown biological affinities, having a central cavity enclosed by a wall of chiefly organic composition.
Origin
1963
1963; < Neo-Latin Acritarcha (neuter plural), irregular < Greek ákrit(os) confused, doubtful (see a-6, critic) + archḗ beginning, origin (cf. archi-)
Related forms
acritarchous, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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