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in the classification of living organisms, a kingdom comprising all unicellular organisms that lack true nuclei (the prokaryote), including principally the bacteria. Formerly called Procaryotae.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
The prokaryotes, a kingdom of primitive microbial organisms characterized by having no defined nucleus or chromosomes; DNA that is not membrane bound; and absence of centrioles, mitotic spindle, microtubules, and mitochondria; division of the ill-defined nuclear zone (nucleoid) is by separation of two masses attached to parts of the cell membrane, then growing apart (a form of amitosis). Monera includes the blue-green algae and bacteria; viruses, which lack a true cell, may have originated as "escaped nucleic acids" or "wild genes" from eukaryotic cells and are not included.
[pl. of Mod. L. moneron, fr. G. monērēs, solitary]
Farlex Partner Medical Dictionary © Farlex 2012
Monerathe kingdom that, in older classifications, contains all prokaryotes.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005