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Comprehensive
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castor oil a colorless or yellowish oil derived from castor beans and used as a lubricant and cathartic.
gamboge a brownish gum resin obtained from certain trees of southern Asia, yielding a yellow pigment that is also used as a cathartic. [1/2 definitions]
ipomoea the dried root of one of this plant, from which a cathartic is made. [1/2 definitions]
purgative a drug or other substance that acts as a purgative agent; cathartic. [1/2 definitions]
senna the dried leaves of this plant, used as a cathartic. [1/2 definitions]