1. The dried juice from the leaves of plants of the genus Aloe (family Liliaceae), from which are derived aloin, resin, emodin, and volatile oils.
2. The dried juice from the leaves of Aloe perryi (socotrine aloes), of Aloe barbadensis (Barbados and Curaçao aloes), or of Aloe capensis (Cape aloes); used as a purgative; used topically in cosmetics where it has no demonstrated value.