Merriam-Webster Collegiate Dictionary - aloe

 noun  Etymology: Middle English, from Late Latin, from Latin, dried juice of ~ leaves, from Greek aloe  Date: before 12th century  1. plural the fragrant wood of an East Indian tree (Aquilaria agallocha) of the mezereon family  2.  a. any of a large genus (Aloe) of succulent chiefly southern African plants of the lily family with basal leaves and spicate flowers  b. the dried juice of the leaves of various ~s used especially formerly as a purgative — usually used in plural but sing. in constr.  c. ~ vera