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From The Collaborative International Dictionary of English v.0.48:
Nux vomica \Nux` vom"i*ca\ [NL., fr. L. nux a nut + vomere to vomit.] 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]