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black horehound

noun
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Definition of black horehound

: an ill-smelling European herb (Ballota nigra) with ovate rugose leaves and whorls of dark purple flowers

— called also black archangel, fetid horehound, stinking horehound

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“Black horehound.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/black%20horehound. Accessed 28 January 2020.

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