The Collaborative International Dictionary of English v.0.48:

Balm \Balm\ (b[aum]m), n. [OE. baume, OF. bausme, basme, F.
   baume, L. balsamum balsam, from Gr. ba`lsamon; perhaps of
   Semitic origin; cf. Heb. b[=a]s[=a]m. Cf. Balsam.]
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   1. (Bot.) An aromatic plant of the genus Melissa.
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   2. The resinous and aromatic exudation of certain trees or
      shrubs. --Dryden.
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   3. Any fragrant ointment. --Shak.
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   4. Anything that heals or that mitigates pain. "Balm for each
      ill." --Mrs. Hemans.
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   Balm cricket (Zool.), the European cicada. --Tennyson.

   Balm of Gilead (Bot.), a small evergreen African and
      Asiatic tree of the terebinthine family (Balsamodendron
      Gileadense). Its leaves yield, when bruised, a strong
      aromatic scent; and from this tree is obtained the balm of
      Gilead of the shops, or balsam of Mecca. This has a
      yellowish or greenish color, a warm, bitterish, aromatic
      taste, and a fragrant smell. It is valued as an unguent
      and cosmetic by the Turks. The fragrant herb
      Dracocephalum Canariense is familiarly called balm of
      Gilead, and so are the American trees, Populus
      balsamifera, variety candicans (balsam poplar), and
      Abies balsamea (balsam fir).
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The Collaborative International Dictionary of English v.0.48:

Balsam \Bal"sam\ (b[add]l"sam), n. [L. balsamum the balsam tree
   or its resin, Gr. ba`lsamon. See Balm, n.]
   1. A resin containing more or less of an essential or
      volatile oil.
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   Note: The balsams are aromatic resinous substances, flowing
         spontaneously or by incision from certain plants. A
         great variety of substances pass under this name, but
         the term is now usually restricted to resins which, in
         addition to a volatile oil, contain benzoic and
         cinnamic acid. Among the true balsams are the balm of
         Gilead, and the balsams of copaiba, Peru, and Tolu.
         There are also many pharmaceutical preparations and
         resinous substances, possessed of a balsamic smell, to
         which the name balsam has been given.
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   2. (Bot.)
      (a) A species of tree (Abies balsamea).
      (b) An annual garden plant (Impatiens balsamina) with
          beautiful flowers; balsamine.
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   3. Anything that heals, soothes, or restores.
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            Was not the people's blessing a balsam to thy blood?
                                                  --Tennyson.
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   Balsam apple (Bot.), an East Indian plant (Momordica
      balsamina), of the gourd family, with red or
      orange-yellow cucumber-shaped fruit of the size of a
      walnut, used as a vulnerary, and in liniments and
      poultices.

   Balsam fir (Bot.), the American coniferous tree, Abies
      balsamea, from which the useful Canada balsam is derived.


   Balsam of copaiba. See Copaiba.

   Balsam of Mecca, balm of Gilead.

   Balsam of Peru, a reddish brown, syrupy balsam, obtained
      from a Central American tree (Myroxylon Pereir[ae] and
      used as a stomachic and expectorant, and in the treatment
      of ulcers, etc. It was long supposed to be a product of
      Peru.

   Balsam of Tolu, a reddish or yellowish brown semisolid or
      solid balsam, obtained from a South American tree
      (Myroxylon toluiferum). It is highly fragrant, and is
      used as a stomachic and expectorant.

   Balsam tree, any tree from which balsam is obtained, esp.
      the Abies balsamea.

   Canada balsam, Balsam of fir, Canada turpentine, a
      yellowish, viscid liquid, which, by time and exposure,
      becomes a transparent solid mass. It is obtained from the
      balm of Gilead (or balsam) fir (Abies balsamea) by
      breaking the vesicles upon the trunk and branches. See
      Balm.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Abies balsamea
    n 1: medium-sized fir of northeastern North America; leaves
         smell of balsam when crushed; much used for pulpwood and
         Christmas trees [syn: balsam fir, balm of Gilead,
         Canada balsam, Abies balsamea]