WordReference Random House Unabridged Dictionary of American English © 2025
Ar•cel•la
(är sel′ə),USA pronunciation n.
- Microbiologya genus of freshwater, ameboid protozoa that secrete a hard, umbrellalike shell having a single opening through which the pseudopodia extend.
- Neo-Latin, equivalent. to Latin arc(a) a chest, box + -ella diminutive suffix
- 1838