The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]