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purgative (adj.)

late 14c., purgatif, in medicine, "having the property of cleansing by expelling impure matter from the body," from Old French purgatif (14c.) and directly from Late Latin purgativus, from purgat-, past-participle stem of Latin purgare "to cleanse, purify" (see purge (v.)). The noun is attested from early 15c., "a medicine that evacuates the intestines" (Old English medical texts have clænsungdrenc).

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Definitions of purgative from WordNet
1
purgative (n.)
a purging medicine; stimulates evacuation of the bowels;
Synonyms: cathartic / physic / aperient
2
purgative (adj.)
strongly laxative;
Synonyms: cathartic / evacuant
From wordnet.princeton.edu