ˈstāvˌzākə(r) noun
Etymology: Middle English staphisagre, staphisagrie, from Latin staphis agria, from Greek, from staphis, astaphis raisin + agria, feminine of agrios wild, from agros field — more at acre
1. : a Eurasian larkspur ( Delphinium staphisagria ) having racemose purple flowers
2. : the seeds of the stavesacre that contain delphinine, are violently emetic and cathartic, and are used in Eurasia as a fish poison