nux vomica

From The Collaborative International Dictionary of English v.0.48:

Nux vomica \Nux` vom"i*ca\ [NL., fr. L. nux a nut + vomere to
   The seed of Strychnos Nuxvomica, a tree which abounds on
   the Malabar and Coromandel coasts of the East Indies. From
   this seed the deadly poisons known as strychnine and brucine
   are obtained. The seeds are sometimes called Quaker buttons.
   [1913 Webster]
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