acritarch

ac·ri·tarch

noun \ˈa-kri-ˌtärk\

Definition of ACRITARCH

: 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

Origin of ACRITARCH

Greek akritos uncertain (from a- + kritos, verbal of krinein to decide) + archē beginning — more at certain, arch-

First Known Use: 1963

Rhymes with ACRITARCH

accent mark, antiquark, cutty sark, deutsche mark, disembark, double-park, great white shark, hierarch, Joan of Arc, make one's mark, matriarch, meadowlark, metalmark, minipark, oligarch, paperbark, patriarch, Plimsoll mark, question mark, service mark, stringybark, telemark, thresher shark, tiger shark, trierarch, watermark, water park