The Collaborative International Dictionary of English v.0.48:

Enlimn \En*limn"\, v. t. [Pref. en- + limn. Cf. Enlumine,
   Illuminate.]
   To adorn by illuminating or ornamenting with colored and
   decorated letters and figures, as a book or manuscript. [R.]
   --Palsgrave.
   [1913 Webster]