sə̇ˈnaŋkəm noun
Etymology: New Latin, from Greek kynanchon dogbane ( Marsdenia erecta ), from kyn- cyn- + -anchon (from anchein to choke) — more at anger
1. capitalized : a genus of twining vines (family Asclepiadaceae) with opposite hanging leaves, small greenish or purplish flowers, and long smooth pods
2. -s : the roots of several vines of the genus Cynanchum formerly used as an emetic