noun
senna; Alexandrian senna; true senna
Refers to the plant Senna alexandrina, known for its medicinal use as a laxative. The katakana spelling センナ is standard.
from Latin
センナは便秘の治療に使われるハーブです。
Senna is an herb used to treat constipation.
From the Latin genus name Senna, via Western botanical terminology.