microorganisms









microorganisms


noun

  1. any organism too small to be viewed by the unaided eye, as bacteria, protozoa, and some fungi and algae.

noun

  1. any organism, such as a bacterium, protozoan, or virus, of microscopic size

n.

  1. An organism of microscopic or submicroscopic size, especially a bacterium or protozoan.

  1. An organism that can be seen only with the aid of a microscope and that typically consists of only a single cell. Microorganisms include bacteria, protozoans, and certain algae and fungi. See Note at germ.

Organisms so small that they can be seen only through a microscope. (See bacteria, protozoa, and viruses.)

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