2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Microorganism \Mi`cro*["o]r"gan*ism\, n. [Micro- + organism.]
(Biol.)
Any microscopic form of life; -- particularly applied to
bacteria and similar organisms, esp. such are supposed to
cause infectious diseases.
From WordNet r 1.6 [wn]:
microorganism
n : any organism (animal or plant) of microscopic size
more about microorganism
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