II. 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 or meeting, Plu.Alc.17, Nic.12; Place of assembly at Samos, Porph.VP9.
3. semicircular seat, armchair, Cic.Lael.1.2, Poll.6.9.
4. semicircular dial, Vitr.9.8.1.
5. semicircular statue-base, IG11(2).287B73 (Delos, iii B.C.), BCH29.543 (ibid.); drum of a half-column, Rev.Phil.43.182 (Didym.).
6. barrel-vault, Ph.Bel. 87.12.
7. theatrical machine, described by Poll.4.127, 131.