Monera
Monera , noun, plural
[New Latin, from Greek mo`nos single.]
(Zoology) The lowest division of rhizopods, including those which resemble the amoebas, but are destitute of a nucleus. [archaic]
2.
(Biology) One of the five kingdoms of living organisms in the five-kingdom classification, consisting of microscopic usually monocellular prokaryotic organisms that mostly reproduce by asexual fission, sporulation, or budding; it includes the bacteria and cyanophytes (blue-green algae), as well as certain primitive pathogenic microbes, such as the Rickettsias.