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British Dictionary definitions for treacle mustard

treacle mustard

noun
  1. a N temperate cruciferous annual plant, Erysimum cheiranthoides, having small yellow flowers. It is a common weed in cultivated ground
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Word Origin

C16: so called because of its alleged medicinal properties. See treacle
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