stavesacre
noun
staves·acre
| \ ˈstāv-ˌzā-kər
\
\
Medical Definition of stavesacre
1
: a Eurasian plant of the genus Delphinium (D. staphisagria) having purple flowers
2
: the ripe seeds of the stavesacre that contain delphinine, are violently emetic and carthartic, and have been used to kill head lice
— called also staphisagria