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Pronunciation:  `mIkrow'owrgu`nizum

WordNet Dictionary
[n]  any organism (animal or plant) of microscopic size

MICROORGANISM is a 13 letter word that starts with M.


 See Also: bacteria, bacterium, being, bug, germ, intestinal flora, microbe, moneran, moneron, organism, pathogen, pilus, protist, protistan, protoctist, virus



Webster's 1913 Dictionary
\Mi`cro*["o]r"gan*ism\, n. [Micro- + organism.]
Any microscopic form of life; -- particularly applied to
bacteria and similar organisms, esp. such are supposed to
cause infectious diseases.

Medical Dictionary
 Definition: An organism that can be seen only through a microscope. Microorganisms include bacteria, protozoa, algae, and fungi. Although viruses are not considered living organisms, they are sometimes classified as microorganisms.
Biology Dictionary
 Definition: A living organism too small to be seen with the naked eye; includes bacteria, fungi, protozoans, and microscopic algae; also includes viruses.
Thesaurus Terms
 Related Terms: adenovirus, aerobe, aerobic bacteria, aerobic organism, amoeba, anaerobe, anaerobic bacteria, anaerobic organism, animalcule, autotrophic organism, bacillus, bacteria, bacterium, being, bug, coccus, colon bacillus, creature, crumb, diatom, disease-producing microorganism, dot, drop, droplet, dyad, echovirus, enterovirus, Euglena, filterable virus, flagellate, fleck, flyspeck, fungus, genetic individual, germ, gnat, grain, gram-negative bacteria, gram-positive bacteria, heterotrophic organism, individual, iota, jot, living being, living thing, microspore, microzoa, midge, minim, minutia, minutiae, mite, mold, monad, morphological individual, mote, nematode, nonfilterable virus, ont, organic being, organism, organization, paramecium, particle, pathogen, physiological individual, picornavirus, pinhead, pinpoint, point, protozoa, protozoon, reovirus, rhinovirus, rickettsia, salmonella, saprophyte, scrap, snip, snippet, speck, spirillum, spirochete, spore, sporozoon, staphylococcus, streptococcus, tetrad, tittle, triad, trypanosome, vanishing point, vibrio, virus, volvox, vorticellum, zooid, zoon, zoospore