paragogic letters

from The Collaborative International Dictionary of English v.0.48

Paragogic \Par`a*gog"ic\, Paragogical \Par`a*gog"ic*al\, a. [Cf.
   F. paragogique.]
   Of, pertaining to, or constituting, a paragoge; added to the
   end of, or serving to lengthen, a word.
   [1913 Webster]

   {Paragogic letters}, in the Semitic languages, letters which
      are added to the ordinary forms of words, to express
      additional emphasis, or some change in the sense.
      [1913 Webster]