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saw-wort

British  
/ ˈsɔːˌwɜːt /

noun

  1. a perennial Old World plant, Serratula tinctoria, having serrated leaves that yield a yellow dye: family Asteraceae (composites)

"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

Example Sentences

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Dyers'-broom, saw-wort, the twigs of the poplar, the osier, and the birch, heather, broom, flowers and twigs, will all of them give yellows of more or less permanence.

From Project Gutenberg

SAW-WORT.—The whole herb produces a yellow tincture.

From Project Gutenberg