S / sēmĭ-orbis
noun

sēmĭ-orbis

gen. sēmĭ-orbis · gender masculine · decl. 3rd
a half-circle; semicircle
a half-circle, semicircle, Sen. Q. N. 1, 8, 4; Amm. 20, 3, 10; 22, 8, 5.