Bailly
ος, ον [μῐ] en forme de demi-cercle, demi-circulaire ; HLD.
8, 14 conj.
Étym. ἡμι-, κύκλος.
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LSJ
ον, (< κύκλος) semicircular, Sch. A.R. 4.1613; — also ἡμίκυκλος, ον, στοά Philostr. Im. 1.12, cf. Hld. 8.14. as Subst., ἡμικύκλιον, τό, semicircle, Arist. APo. 41b17, Ph. 264b24; hemisphere, Ach.Tat. Intr. Ar. 27, Heph.Astr. 2.11; of a tactical formation, κατὰ τὸ ἡ. Onos. 21.5.
a place for public entertainment or meeting, Plu. Alc. 17, Nic. 12; Place of assembly at Samos, Porph. VP 9.
semicircular seat, armchair, Cic. Lael. 1.2, Poll. 6.9.
semicircular dial, Vitr. 9.8.1.
semicircular statue-base, IG 11(2).287 B 73 (Delos, iii BC), BCH 29.543 (ibid.); drum of a half-column, Rev.Phil. 43.182 (Didym.).
barrel-vault, Ph. Bel. 87.12.
theatrical machine, described by Poll. 4.127, 131.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
halbkreisförmig, Schol. Ap.Rh. 4.1614 u. a.Sp.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)