spurge (n.)youdaoicibaDictYouDict[spurge 词源字典]
plant species, late 14c., from Old French espurge, from espurgier "to purge" (transitive and intransitive), from Latin expurgare, from ex- "out" (see ex-) + purgare "to purge" (see purge (v.)). So called from the purgative and emetic properties of the plant's root.[spurge etymology, spurge origin, 英语词源]