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thoroughwort

thor·ough·wort [ thúrrō wùrt, thúrrō wàwrt, thúrrə wùrt, thúrrə wàwrt ] (plural thor·ough·worts or thor·ough·wort)


noun 
Definition:
 
U.S. plants 
Same as  boneset


[Late 16th century. <thorough "through," because the plant's stem appears to grow through its leaves]
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