The Collaborative International Dictionary of English v.0.48:

Inkhorn \Ink"horn`\, n. [Ink + horn; cf. F. cornet [`a] encre,
   G. dintenhorn.]
   A small bottle of horn or other material formerly used for
   holding ink; an inkstand; a portable case for writing
   materials. "With a writer's inkhorn by his side." --Ezek. ix.
   2.
   [1913 Webster]

         From his pocket the notary drew his papers and inkhorn.
                                                  --Longfellow.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Inkhorn \Ink"horn"\, a.
   Learned; pedantic; affected. [Obs.] "Inkhorn terms." --Bale.
   [1913 Webster]

Easton's 1897 Bible Dictionary:

Inkhorn
   The Hebrew word so rendered means simply a round vessel or cup
   for containing ink, which was generally worn by writers in the
   girdle (Ezek. 9:2, 3,11). The word "inkhorn" was used by the
   translators, because in former times in this country horns were
   used for containing ink.