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hedge hyssop

noun
  1. any plant of the genus Gratiola, a bitter herb used medicinally.
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Also hedge-hys·sop [hej-his-uh p] /ˈhɛdʒˌhɪs əp/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for hedge hyssop

hedge hyssop

noun
  1. any of several North American scrophulariaceous plants of the genus Gratiola, esp G. aurea, having small yellow or white flowers
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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