Ameba (noun)

A single-celled organism that moves by means of pseudopodia, typically found in freshwater and soil.

Origin:

Late 19th century, from latin amoeba, from greek amoibē (change).

Examples:

1. Amebas are simple, single-celled organisms.
2. Amebas are found in a variety of environments, including freshwater, soil and the human gut.
3. Amebas are commonly studied in biology classes as an example of protozoan.
4. Amebas can cause several diseases including amebiasis and dysentery.
5. Amebas reproduce by binary fission, where one cell divides into two.