deadly nightshade

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bel·la·don·na

(bel'ă-don'ă),
Atropa belladonna (family Solanaceae); a perennial herb with dark or yellow purple flowers and shining purplish-black berries; the leaves (0.3% belladonna alkaloids) and root (0.5% belladonna alkaloids) orginally were sources of atropine scopalamine and related alkaloids, which are anticholinergic. Belladonna is used as a powder (0.3% belladonna alkaloids, calculated as hyoscyamine) and tincture in the treatment of diarrhea, asthma, colic, and hyperacidity.
Synonym(s): deadly nightshade
[It. bella, beautiful, + donna, lady]

belladonna

Drug slang
A regional term for phencyclidine (PCP).
 
Herbal medicine
A perennial herb which is highly toxic if taken internally at full concentration; belladonna contains scopolamine and hyoscyamine, which are used as antispasmodics in mainstream medicine and for gout and rheumatism in herbal medicine.
 
Toxicity
Belladonna causes diarrhoea, dilated pupils, dry mouth, flushing, hallucinations, hypertension, incoordination, nausea, speech impairment, tachycardia, vision impairment, vomiting, coma, possibly death.

Homeopathy B
elladonna is used for conditions of abrupt onset, acute infections, cough, earache, fever, headaches, seizures, sore throat, teething in children, urinary tract infections.

Ophthalmology
Belladonna derivatives—e.g., homatropine eye drops—are instilled into the eye to dilate the pupil

bel·la·don·na

(bel'ă-don'ă)
Atropa belladonna; a perennial herb with dark purple flowers and berries. Originally used as a source of atropine.
Synonym(s): deadly nightshade.
[It. bella, beautiful, + donna, lady]

deadly nightshade

The source of the drug BELLADONNA.

deadly nightshade

Atropa belladonna. Commonly confused with Solanum spp.