noun Paleontology.

any of various microfossils, of unknown biological affinities, having a central cavity enclosed by a wall of chiefly organic composition.

Nearby words

  1. acriflavine hydrochloride,
  2. acrilan,
  3. acrimonious,
  4. acrimoniously,
  5. acrimony,
  6. acritical,
  7. acro dance,
  8. acro-,
  9. acroagnosis,
  10. acroanesthesia

Origin of acritarch

1963; < New Latin Acritarcha (neuter plural), irregular < Greek ákrit(os) confused, doubtful (see a-6, critic) + archḗ beginning, origin (cf. archi-)

Related formsac·ri·tar·chous, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019