The Collaborative International Dictionary of English v.0.48:

Paragoge \Par`a*go"ge\ (p[a^]r`[.a]*g[=o]"j[-e]), n. [L., fr.
   Gr. paragwgh`, from para`gein to lead beside, protract; para`
   beside + 'a`gein to lead.]
   1. (Gram.) The addition of a letter or syllable to the end of
      a word, as withouten for without.
      [1913 Webster]

   2. (Med.) Coaptation. [Obs.] --Dunglison.
      [1913 Webster] Paragogic