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]