Flagellum (noun)

A whip-like structure, especially a slender whip-like appendage on some bacteria and protozoa that propels them through a liquid medium.

Origin:

Late 17th century: from latin, "whip".

Examples:

1. The bacterium uses its flagellum to move through the liquid medium.
2. The flagellum is an important structure for the bacterium's survival.
3. The flagellum's movement creates a current that helps to distribute the bacterium.
4. The flagellum's length and speed of movement determine the bacterium's movement.
5. The flagellum is made up of protein filaments and is a unique structure in the bacterium.