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acritarchous

 - 1 dictionary result

ac⋅ri⋅tarch

  [ak-ri-tahrk]
Use acritarchous in a Sentence
–noun Paleontology.
any of various microfossils, of unknown biological affinities, having a central cavity enclosed by a wall of chiefly organic composition.
Origin:
1963; < NL Acritarcha (neut. pl.), irreg. < Gk ákrit(os) confused, doubtful (see a- 6 , critic ) + arch beginning, origin (cf. archi- )

Related forms:
ac⋅ri⋅tar⋅chous, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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