noun.
A fruit, as that of the Umbelliferæ, consisting of two or more indehiscent, inferior, one-seeded carpels, separating at maturity from each other and from the slender axis. Also called carpadelium.
the GNU version of the Collaborative International Dictionary of English
noun.
The peculiar fruit of fennel, carrot, parsnip, and the like, consisting of a pair of carpels pendent from a supporting axis.