cœlosperm

cœlosperm Bot.

(ˈsiːləʊˌspɜːm)

[f. Gr. κοῖλο-ς hollow + σπέρµα seed.]

1. The seed of some umbelliferous plants, which is curved longitudinally so as to be concave on the inner surface.

2. An umbelliferous plant having such a seed.

Webster cites Henslow.