\Hem"i*cy`cle\, n. [L. hemicyclus, Gr. ?; ? + ?.]
1. A half circle; a semicircle.
2. A semicircular place, as a semicircular arena, or room, or
   part of a room.
         The collections will be displayed in the hemicycle
         of the central pavilion.              --London
                                               Academy.