Source : Webster's Revised Unabridged Dictionary (1913)

Mucilage \Mu"ci*lage\, n. [F., from L. mucilago a musty juice,
   fr. mucus mucus, slime. See {Mucus}.]
   1. (Bot. Chem.) A gummy or gelatinous substance produced in
      certain plants by the action of water on the cell wall, as
      in the seeds of quinces, of flax, etc.

   2. An aqueous solution of gum, or of substances allied to it;
      as, medicinal mucilage; mucilage for fastening envelopes.

Source : WordNet®

mucilage
     n 1: a gelatinous substance secreted by plants
     2: cement consisting of a sticky substance that is used as an
        adhesive [syn: {glue}, {gum}]