noun
a highly toxic plant of the nightshade family, with purple bell-shaped flowers and glossy black berries
adjective
describing a characteristic of the plant belladonna
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Belladonna is a highly toxic plant that has historically been used for medicinal and cosmetic purposes.
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I heard that belladonna can be really dangerous if ingested.
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Watch out for that belladonna stuff, it's no joke.
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Her beauty was like a belladonna flower, alluring yet potentially harmful.