Entry 2 senses Webster, 1913 Sanguinaria · San·gui·na·ri·a · IPA /ˌsæŋ.ɡwɪˈnɛɹi.ə/ 01 n. A genus of plants of the Poppy family. 1. A genus of plants of the Poppy family.(Bot.) 2. The rootstock of the bloodroot, used in medicine as an emetic, etc.