triceratium (or ti as shi)

[Mod. Latin, from Gr. trike ratos =three-horned: pref. tri-, and Gr. keras (gen it. keratos ) =a horn.] Botany: A genus of Diatomacese. Frustules free, valves triangular, areolar, each angle generally with a minute tooth or short horn. Kützing describes fourteen species. trich-, pref. [TRICHO-.]