rambutan UK [ɹamˈbjʉːtən]US /ɹæmˈbutən/ noun2 •The edible fruit of this tree.Old women crouched over bags of Siamese rice, skeps of red and green peppers, purple egg-plants, bristly rambutans, pineapples, durians. — 1956 •A tree of species Nephelium lappaceum, of Southeast Asia. formsrambutans