Source : Webster's Revised Unabridged Dictionary (1913)

Deipnosophist \Deip*nos"o*phist\, n. [Gr. deipnosofisth`s;
   dei^pnon a meal + sofisth`s a wise man, sophist.]
   One of an ancient sect of philosophers, who cultivated
   learned conversation at meals.

Source : WordNet®

deipnosophist
     n : someone skilled at across-the-table chit chat