Skip to definition.
NEW version 6: Get the FREE one-click dictionary software for Windows.


Noun: microorganism  ,mI-krow'or-gu,ni-zum
  1. Any organism of microscopic size
    "this microorganism is a producer of disease";
    - micro-organism

Derived forms: micro-organisms, microorganisms

Type of: being, organism

Encyclopedia: Microorganism