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ceratium

ceratium Bot.
  (sɪˈreɪʃ(ɪ)əm)
  [L. ceratium = siliqua, a. Gr. κεράτιον carob-bean, lit. little horn, dim. of κέρας horn: the application is modern.]
  A long slender one-celled many-seeded superior fruit, shaped like a siliqua, but having placentæ alternate with the lobes of the stigma.

1880 Gray Bot. Text-bk. 402 Ceratium, a siliquiform capsule, such as that of Corydalis, Cleome, etc.

Oxford English Dictionary

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