The Collaborative International Dictionary of English v.0.48:
Hip \Hip\, n. [OE. hepe, AS. he['o]pe; cf. OHG. hiufo a bramble bush.] (Bot.) The fruit of a rosebush, especially of the English dog-rose (Rosa canina); called also rose hip. [Written also hop, hep.] [1913 Webster] Hip tree (Bot.), the dog-rose. [1913 Webster]WordNet (r) 3.0 (2006):
rose hip n 1: the fruit of a rose plant [syn: hip, rose hip, rosehip]