CORYNOCARPUS, in botany: A genus of the monogynia order, belonging to the pentandria class of plants. The calyx is a pentaphyllous perianthium; the corolla consists of five roundish, erect, and hollow petals; the stamina five subulated filaments arising from the base of the petals; the antheræ are erect and oblong; the pericarpium a monospermous, turbinately elevated nut.