belladon'na

[It. bell a, beautiful, + donna, lady.] Deadly nightshade, Airopa belladonna, a perennial herb with dark purple flowers and shimng purplish black berries. The leaves and root are employed in medicine, belladon'na fo'lia (U.S. and Br.), belladonna leaves, the dried leaves of Atropa belladonna, containing 0.3 per cent, of mydriatic alkaloids mydriatic, narcotic, anodyne,