goldthread

[ gohld-thred ]
/ ˈgoʊldˌθrɛd /

noun

a white-flowered plant, Coptis trifolia, of the buttercup family, having a slender, yellow root that is sometimes used as a tonic.

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Origin of goldthread

An Americanism dating back to 1770–80; gold + thread
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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British Dictionary definitions for goldthread

goldthread
/ (ˈɡəʊldˌθrɛd) /

noun

a North American woodland ranunculaceous plant, Coptis trifolia (or C. groenlandica), with slender yellow roots
the root of this plant, which yields a medicinal tonic and a dye
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012