Old English alewe "fragrant resin of an East Indian tree," a Biblical usage, from Latin aloe, from Greek aloe, translating Hebrew ahalim (plural, perhaps ultimately from a Dravidian language).
The Greek word probably was chosen for resemblance of sound to the Hebrew, because the Greek and Latin words referred originally to a genus of plants with spiky flowers and bitter juice, used as a purgative drug, a sense which appeared in English late 14c. The word was then misapplied to the American agave plant in 1680s. The "true aloe" consequently is called aloe vera.
aloe al·oe (āl'ō)
Any of various chiefly African plants of the genus Aloe, having rosettes of succulent, often spiny-margined leaves and long stalks bearing yellow, orange, or red tubular flowers.
Any of various laxative drugs obtained from the processed juice of a certain species of aloe.