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bel·la·don·na (bĕlə-dŏnə)
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n.
1. A poisonous perennial herb (Atropa belladonna) native to Eurasia and northern Africa and naturalized in parts of North America, having nodding, purplish-brown, bell-shaped flowers and glossy black berries. Also called deadly nightshade.
2. An alkaloidal extract or tincture derived from this plant and used in medicine.

[Italian : bella, feminine of bello, beautiful (from Latin bellus; see deu-2 in the Appendix of Indo-European roots) + donna, lady; see DONNA (the plant perhaps being so called because women of Italian courts during the Renaissance are said to have used the juice of belladonna berries to make their eyes more attractive by dilating their pupils) .]
(click for a larger image)
belladonna
fruit and flower of the belladonna plant
Atropa belladonna

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.