an organism lacking a true nucleus: in some systems of biological classification, any of a superkingdom (Prokaryotae) of organisms, including the viruses and monerans
An organism of the kingdom Monera (or Prokaryotae), comprising the bacteria and cyanobacteria, characterized by the absence of a distinct, membrane-bound nucleus or membrane-bound organelles, and by DNA that is not organized into chromosomes. Also called moneran.