Word Study
stavesacre
CIDE DICTIONARY
stavesacre, n. [Corrupted from NL. staphis agria, Gr. stafi`s dried grape + 'a`grios wild.].
A kind of larkspur (Delphinium Staphysagria ), and its seeds, which are violently purgative and emetic. They are used as a parasiticide, and in the East for poisoning fish. [1913 Webster]
OXFORD DICTIONARY
stavesacre, n. a larkspur, Delphinium staphisagria, yielding seeds used as poison for vermin.
Etymology
ME f. L staphisagria f. Gk staphis agria wild raisin
For further exploring for "stavesacre" in Webster Dictionary Online