[mahy-kroh-awr-guh-niz-uh
m] 
| any organism too small to be viewed by the unaided eye, as bacteria, protozoa, and some fungi and algae. |
| mi·cro·or·gan·ism (mī'krō-ôr'gə-nĭz'əm) n. An organism of microscopic or submicroscopic size, especially a bacterium or protozoan. |
Organisms so small that they can be seen only through a microscope. (See bacteria, protozoa, and viruses.)
microorganism mi·cro·or·gan·ism (mī'krō-ôr'gə-nĭz'əm)
n.
An organism of microscopic or submicroscopic size, especially a bacterium or protozoan.
