Aloin

noun

1. A bitter yellow crystalline compound obtained from certain aloes and having laxative properties. Its use in laxatives was banned in the United States in 2002.
2. A crystalline bitter principle obtained from aloes in pale-yellow prismatic needles, grouped in stars.
3. A bitter purgative principle in aloes.
4. A glycoside derivative of anthracene, found in aloe, that is used as a laxative.