hemicycle noun.
['hɛmɪsʌɪk(ǝ)l] L15.[French hémicycle from Latin hemicyclium from Greek hēmikuklion, formed as HEMI- + kuklos circle.]A semicircle; a semicircular structure.
■ J. Archer The hemicycle is a round bank of seats inside the theatre. [TahlilGaran] English Dictionary ▲