Archivolt

1. n. More commonly, the molding or other ornaments with which the wall face of the voussoirs of an arch is charged.
2. n. The architectural member surrounding the curved opening of an arch, corresponding to the architrave in the case of a square opening.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.