senna

/S EH1 N AH0/
noun
  1. 1

    Any of several plants of the tribe Cassieae, especially those of the genera Cassia and Senna, whose leaves and pods are used as a purgative and laxative.

  2. 2

    The dried leaves or pods of these plants (especially of Senna alexandrina, syn. Cassia angustifolia or Cassia acutifolia), used medicinally.

  3. 3

    Senna glycoside, a laxative.

Source: https://en.wiktionary.org/wiki/senna