Microorganism

[maɪkrəʊ'ɔːg(ə)nɪz(ə)m] or [,maɪkro'ɔrgən,ɪzəm]

(noun.) any organism of microscopic size.

Typed by Eugenia--From WordNet

(n.) Any microscopic form of life; -- particularly applied to bacteria and similar organisms, esp. such are supposed to cause infectious diseases.

Editor: Rosanne

All such very small plants and animals are known as _microorganisms_. Bertha M. Clark. General Science.

Inputed by Jenny