ceratium

from The Century Dictionary.

• noun Pl. ceratia (-shiä). In botany, a capsule similar to the ordinary siliqua of the Cruciferæ, but without a septum, and having the lobes of the stigma alternate with the placentæ, as in Corydalis.
• noun A genus of flagellate infusorians, related to Peridinium, by some referred to a family Peridiniidæ. C. tripos is an example: so called from the three processes besides the flagellum.