The Collaborative International Dictionary of English v.0.48:
Boxthorn \Box"thorn`\, n. (Bot.) A plant of the genus Lycium, esp. Lycium barbarum. [1913 Webster]WordNet (r) 3.0 (2006):
boxthorn n 1: any of various shrubs or vines of the genus Lycium with showy flowers and bright berries [syn: matrimony vine, boxthorn]