acritarch

noun ac·ri·tarch \ ˈa-kri-ˌtärk \
Updated on: 15 Nov 2017

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 and Etymology of acritarch

Greek ákritos "confused, uncertain" (from a- 2a- + kritós, verbal adjective of krī́nein "to separate, decide") + archḗ "beginning" — more at 1certain, 1arch-


Learn More about acritarch


Seen and Heard

What made you want to look up acritarch? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!