Entry 2 senses · 2 variants Webster, 1913 Vicine · Vic·ine · IPA /ˈvɪsɪn/ a. n. 01 a. Near; neighboring; vicinal. 1. Near; neighboring; vicinal.[R.] 02 n. An alkaloid extracted from the seeds of the vetch (Vicia sativa) as a white crystalline substance. 1. An alkaloid extracted from the seeds of the vetch (Vicia sativa) as a white crystalline substance.(Chem.)