The Collaborative International Dictionary of English v.0.48:

aloes \aloes\ n.
   a purgative made from the leaves of aloe. Same as aloe[3].

   Syn: bitter aloes
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

aloe \al"oe\ ([a^]l"n[-o]), n.; pl. Aloes ([a^]l"[=o]z). [L.
   alo["e], Gr. 'alo`h, aloe: cf. OF. aloe, F. alo[`e]s.]
   1. pl. The wood of the agalloch. [Obs.] --Wyclif.
      [1913 Webster]

   2. (Bot.) [capitalized] A genus of succulent plants, some
      classed as trees, others as shrubs, but the greater number
      having the habit and appearance of evergreen herbaceous
      plants; from some of which are prepared articles for
      medicine and the arts. They are natives of warm countries.
      [1913 Webster]

   3. pl. (Med.) The inspissated juice of several species of
      aloe, used as a purgative. [Plural in form but
      syntactically singular.] AS
      [1913 Webster]

   American aloe, Century aloe, the agave. See Agave.
      [1913 Webster]

WordNet (r) 3.0 (2006):

aloes
    n 1: a purgative made from the leaves of aloe [syn: aloes,
         bitter aloes]

Easton's 1897 Bible Dictionary:

Aloes
   (Heb. 'ahalim), a fragrant wood (Num. 24:6; Ps. 45:8; Prov.
   7:17; Cant. 4:14), the Aquilaria agallochum of botanists, or, as
   some suppose, the costly gum or perfume extracted from the wood.
   It is found in China, Siam, and Northern India, and grows to the
   height sometimes of 120 feet. This species is of great rarity
   even in India. There is another and more common species, called
   by Indians aghil, whence Europeans have given it the name of
   Lignum aquile, or eagle-wood. Aloewood was used by the Egyptians
   for embalming dead bodies. Nicodemus brought it (pounded
   aloe-wood) to embalm the body of Christ (John 19:39); but
   whether this was the same as that mentioned elsewhere is
   uncertain.

     The bitter aloes of the apothecary is the dried juice of the
   leaves Aloe vulgaris.