• WordNet 3.6
    • n senega perennial bushy herb of central and southern United States having white flowers with green centers and often purple crest; similar to Seneca snakeroot
    • n senega dried root of two plants of the genus Polygala containing an irritating saponin
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Webster's Revised Unabridged Dictionary
    • n Senega (Med) Seneca root.
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Century Dictionary and Cyclopedia
    • n senega A drug consisting of the root Polygala Senega, the Seneca snakeroot. The drug is said to have been used as an antidote for the bite of the rattlesnake. It is now almost exclusively used as an expectorant and diuretic. Also seneca.
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Chambers's Twentieth Century Dictionary
    • n Senega sen′ē-ga the seneca snakeroot, the dried root of Polygala Senega, good for snake-bites.
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In literature:

The central emetics are apomorphine, tartar emetic, ipecacuanha, senega and squill.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3" by Various
By the above-mentioned statute, gum senega, or gum arabic, being among the enumerated dyeing drugs, might be imported duty free.
"An Inquiry Into the Nature and Causes of the Wealth of Nations" by Adam Smith