The Collaborative International Dictionary of English v.0.48:

Mucilaginous \Mu`ci*lag"i*nous\, a. [Cf. F. mucilagineux. See
   Mucilage.]
   1. Partaking of the nature of, or resembling, mucilage;
      moist, soft, and viscid; slimy; ropy; as, a mucilaginous
      liquid.
      [1913 Webster]

   2. Of, pertaining to, or secreting, mucilage; as, the
      mucilaginous glands.
      [1913 Webster]

   3. Soluble in water, but not in alcohol; yielding mucilage;
      as, mucilaginous gums or plants. --
      Mu`ci*lag"i*nous*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

mucilaginous
    adj 1: having the sticky properties of an adhesive [syn:
           gluey, glutinous, gummy, mucilaginous, pasty,
           sticky, viscid, viscous]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "mucilaginous":
   adhesive, amylaceous, clabbered, clammy, clotted, coagulated,
   curdled, doughy, gaumy, gelatinous, glairy, gluelike, gluey,
   glutenous, glutinose, glutinous, gooey, grumous, gumbo, gumbolike,
   gumlike, gummous, gummy, heavy, inspissated, jelled, jellied,
   jellylike, pasty, ropy, slabby, slimy, slithery, starchy, sticky,
   stodgy, stringy, syrupy, tacky, tenacious, thick, thickened, tough,
   tremelloid, tremellose, viscid, viscose, viscous