Prokaryote: any of the typically unicellular microorganisms that lack a distinct nucleus and membrane-bound organelles and that are classified as a kingdom (Prokaryotae syn. Monera) or into two domains (Bacteria and Archaea) — compare archaea, bacterium, eukaryote



Eukaryotes: any of a domain (Eukarya) or a higher taxonomic group (Eukaryotes) above the kingdom that includes organisms composed of one or more cells containing visibly evident nuclei and organelles — compare archaea, bacterium, prokaryote

Definitions of Prokaryote and Eukaryote