prokaryote

https://doi.org/10.1351/goldbook.16009
Unicellular organism, characterized by the absence of a membrane-enclosed nucleus.
Note: Prokaryotes include bacteria, blue–green algae, and mycoplasmas.
Source:
PAC, 2007, 79, 1153. (Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)) on page 1290 [Terms] [Paper]