an intensely bitter, crystalline, water-soluble powder composed of the active principles of and obtained from , used chiefly as a purgative.
historical examples

aloin pills empty the bowel without much attendant irritation.
a system of practical medicine by american authors, vol. ii various

doans dinner pills contain two drastic purgatives, podophyllin and aloin.
alcohol: a dangerous and unnecessary medicine, how and why martha m. allen

a bitter crystalline compound derived from various species of aloe: used as a laxative and flavouring agent

aloin al·o·in (āl’ō-ĭn)
a bitter, yellow crystalline compound obtained from aloe and used as a laxative.

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