[ac.ri.tarch] n [Gk akritos uncertain (fr. a- + kritos, verbal of krinein to decide) + arche beginning--more at certain, arch-] (1963): any of a group of fossil one-celled marine planktonic organisms of uncertain and possibly various taxonomic affinities held to represent the earliest known eukaryotes
ACRITARCH
Meaning of ACRITARCH in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012