<p><strong>Noun:</strong></p><ul><li>A colorless, crystalline poison, C₂H₂N₂O₂, obtained chiefly by extraction from the seeds of nux vomica, formerly used as a central nervous system stimulant.</li><li>An Indian tree, <em>Strychnos nux-vomica</em>, of the logania family, having small, yellowish-white flowers in clusters, berry-like fruit, and seeds that yield strychnine.</li></ul>