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brierroot
noun
variants: or
briarroot
Definition of brierroot
: the root of various plants (such as Erica arborea of southern Europe or members of the genera Rhododendron and Smilax of the U.S.) used in the manufacture of tobacco pipes; especially : the burl of the brier used in the manufacture of briars
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Origin and Etymology of brierroot
2brier, briar + root
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