[ sen-uh ]
/ ˈsɛn ə /
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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.
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Origin of senna

1535–45; <New Latin <Arabic sanā
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use senna in a sentence

British Dictionary definitions for senna (1 of 2)

/ (ˈsɛnə) /

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
See also bladder senna

Word Origin for senna

C16: via New Latin from Arabic sanā

British Dictionary definitions for senna (2 of 2)

/ (ˈsɛnə) /

Ayrton (ˈɛətən). 1960–94, Brazilian racing driver: world champion (1988, 1990, 1991)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for senna

[ sĕnə ]

A plant of the genus Cassia, used as a laxative.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.