prokaryote

n. unicellular organism that does not have a nuclear membrane or cell organelles (such as bacteria and blue-green algae)

Prokaryotes (IPA: //) are a group of organisms that lack a cell nucleus (= karyon), or any other membrane-bound organelles. Most are unicellular, but some prokaryotes are multicellular organisms. The word prokaryotes comes from the Old Greek pro- before + karyon nut or kernel, referring to the cell nucleus, + suffix -otos, pl. -otes; it is also spelled "procaryotes".
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Prokaryote /pro·kary·ote/ a unicellular organism lacking a true nucleus and nuclear membrane, having genetic material composed of a single loop of [more]Prokaryote - Community and Resources

Noun
1. a unicellular organism having cells lacking membrane-bound nuclei; bacteria are the prime example but also included are blue-green algae and actinomycetes and mycoplasma
(synonym) procaryote
(antonym) eukaryote, eucaryote
(hypernym) organism, being

Cell lacking a discrete nucleus and other special subcellular compartments. Bacteria and viruses are prokaryotes. Humans are not prokaryotes, but rather eukaryotes.