The Collaborative International Dictionary of English v.0.48:

Monera \Mo*ne"ra\, n. pl. [NL., fr. Gr. mo`nos single.] (Zool.)
   The lowest division of rhizopods, including those which
   resemble the amoebas, but are destitute of a nucleus.
   [archaic]
   [1913 Webster]

   2. (Biol.) 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.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Moneron \Mo*ne"ron\, n.; pl. L. Monera; E. Monerons. [NL.]
   (Zool.)
   One of the Monera.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Monera
    n 1: prokaryotic bacteria and blue-green algae and various
         primitive pathogens; because of lack of consensus on how to
         divide the organisms into phyla informal names are used for
         the major divisions [syn: Monera, kingdom Monera,
         Prokayotae, kingdom Prokaryotae]