The Collaborative International Dictionary of English v.0.48:

Mucific \Mu*cif"ic\, a. [Mucus + L. -ficare (in comp.) to make.
   See -fy.]
   1. (Med.) Inducing or stimulating the secretion of mucus;
      blennogenous.
      [1913 Webster]

   2. (Physiol.) Secreting mucus.
      [1913 Webster]