Source : Webster's Revised Unabridged Dictionary (1913)

Antefix \An"te*fix`\, n.; pl. E. {Antefixes}; L. {Antefixa}. [L.
   ante + fixus fixed.] (Arch.)
   (a) An ornament fixed upon a frieze.
   (b) An ornament at the eaves, concealing the ends of the
       joint tiles of the roof.
   (c) An ornament of the cymatium of a classic cornice,
       sometimes pierced for the escape of water.

Source : WordNet®

antefix
     n : carved ornament at the eaves of a tile roof concealing the
         joints between tiles
     [also: {antefixa} (pl)]