From The Collaborative International Dictionary of English v.0.48 :
Granadilla \Gran`a*dil"la\, n. [Sp., dim. of granada
pomegranate. See Grenade, Garnet.] (Bot.)
The fruit of certain species of passion flower (esp.
Passiflora quadrangularis) found in Brazil and the West
Indies. It is as large as a child's head, and is a good
dessert fruit. The fruit of Passiflora edulis is used for
flavoring ices.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
Passiflora quadrangularis
n 1: tropical American passionflower yielding the large
granadilla fruit [syn: granadilla, giant granadilla,
Passiflora quadrangularis]