Etymology
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spurge (n.)

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.

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Definitions of spurge

spurge (n.)
any of numerous plants of the genus Euphorbia; usually having milky often poisonous juice;
From wordnet.princeton.edu