any plant, shrub, or tree belonging to the genus Cassia, of the legume family, having pinnate leaves and large clusters of flowers.
any of various cathartic drugs consisting of the dried leaflets of certain of these plants, as one drug (Alexandrian senna) derived from C. acutifolia, or another (Tinnevelly senna) derived from C. angustifolia.
Contemporary Examples

Jacob Bernstein on why the Academy snubbed Bill Cunningham New York, senna, and other crowd-pleasers.
Oscar’s Documentary Myopia: Popular Films Don’t Get Nominated Jacob Bernstein February 1, 2012

Historical Examples

Every visit was duly put down in the ledger and charged for—as poor little senna will tell you.
Punch, or the London Charivari, Vol. 104, March 18, 1893 Various

“Off with that old senna T-pot,” said Burr major scornfully.
Burr Junior G. Manville Fenn

Regularly every year come the Zulus in force to senna and Shupanga for the accustomed tribute.
A Popular Account of Dr. Livingstone’s Expedition to the Zambesi and Its Tributaries David Livingstone

If the senna is distasteful a smaller quantity may be used at first.
The Mother and Her Child William S. Sadler

Prunes and figs cooked with senna leaves are likewise simple laxatives which are both palatable and effective.
Dietetics for Nurses Fairfax T. Proudfit

When at senna, in the Makololo country, a woman was seized by a crocodile.
Stanley in Africa James P. Boyd

senna, acidulated with lemon juice or tamarinds, answered sometimes remarkably well, when the stomach could retain it.
North American Medical and Surgical Journal, Vol. 2, No. 3, July, 1826 Various

It is said to have been composed chiefly of senna and fennel leaves.
The Mystery and Romance of Alchemy and Pharmacy Charles John Samuel Thompson

Calomel three grains every third day, with infusion of senna.
Zoonomia, Vol. II Erasmus Darwin

any of various tropical plants of the leguminous genus Cassia, esp C. angustifolia (Arabian senna) and C. acutifolia (Alexandrian senna), having typically yellow flowers and long pods
senna leaf, the dried leaflets of any of these plants, used as a cathartic and laxative
senna pods, the dried fruits of any of these plants, used as a cathartic and laxative
Ayrton (ˈɛətən). 1960–94, Brazilian racing driver: world champion (1988, 1990, 1991)

tropical shrub, 1540s, from Modern Latin senna, from Arabic sana. Earlier was sene (c.1400), from French.

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