any plant of the genus Gratiola, a bitter herb used medicinally.
- Also hedge-hys·sop [hej-his-uhp]. /ˈhɛdʒˌhɪs əp/.
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British Dictionary definitions for hedge hyssop
any of several North American scrophulariaceous plants of the genus Gratiola, esp G. aurea, having small yellow or white flowers
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