ἡμι-κύκλιος · hēmi-kyklios — LSJ
semicircular
semicircular, Sch. A.R. 4.1613:—also ἡμί-κυκλος, ον, στοά Philostr. Im. 1.12, cf. Hld. 8.14.
II semicircle, hemisphere
as Subst., ἡμι-κύκλιον, τό, semicircle, Arist. APo. 41b17, Ph. 264b24; hemisphere, Ach.Tat. Intr.Arat. 27, Heph.Astr. 2.11; of a tactical formation, κατὰ τὸ ἡ. Onos. 21.5.
2 a place for public entertainment, meeting, Place of assembly
a place for public entertainment or meeting, Plu. Alc. 17, Nic. 12; Place of assembly at Samos, Porph. VP 9.
3 semicircular seat, armchair
semicircular seat, armchair, Cic. Lael. 1.2, Poll. 6.9.
4 semicircular dial
semicircular dial, Vitr. 9.8.1.
5 semicircular statue-base, drum of a half-column
semicircular statue-base, IG 11(2).287B 73 (Delos, iii B.C.), BCH 29.543 (ibid.); drum of a half-column, Rev.Phil. 43.182 (Didym.).
6 barrel-vault
barrel-vault, Ph. Bel. 87.12.
7 theatrical machine
theatrical machine, described by Poll. 4.127, 131.