Definition from Wiktionary, the free dictionary
From Italian bella donna, literally 'beautiful lady', altered by folk etymology from Medieval Latin bladona 'nightshade', from Gaulish. The folk etymology was motivated by the cosmetic use of nightshade for dilating the eyes.
- a plant, Atropa belladonna, having purple bell-shaped flowers and poisonous black glossy berries; deadly nightshade
- an alkaloid extracted from this plant, sometimes used medicinally, containing atropine
a plant, Atropa belladonna
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- Cathy teetered downstairs on very high heels, her hair swept up in a disintegrating “brioche,” her eyes glistening with belladonna drops. - Edmund White, "My Women" 
- Hyphenation: bel‧la‧don‧na
Declension of belladonna (type koira)