Etymology
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wort (n.)

"a plant," Old English wyrt "root, herb, vegetable, plant, spice," from Proto-Germanic *wurtiz (source also of Old Saxon wurt, Old Norse, Danish urt, Old High German wurz "plant, herb," German Wurz, Gothic waurts, Old Norse rot "root"), from PIE root *wrād- "branch, root." St. John's wort attested from 15c.

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Definitions of wort

wort (n.)
usually used in combination: `liverwort'; `milkwort'; `whorlywort';
wort (n.)
unfermented or fermenting malt;
From wordnet.princeton.edu