in botany: A genus of the monandria order, belonging to the monocotyledon class of plants; and in the natural method ranking under the 22d order, Holaraceae. The male calyx is bipartite; there is no corolla; the filament is long: The female Ceratonia calyx is diphyllous, and grown to the germen; there is no corolla; the styles are two; the seed is two-horned and comprised.