Orbículus, pen. cor. Diminutiunm Plin. A little circle.Orbiculus pro Trochlea. Cato. A pulley. Vide Chelonia. Cheloniorum.
Lewis and Short: Latin dictionary
orbĭcŭlus, i, m.dim. [orbis], a small disk; a sheave, roller, pulley, etc. (anteclass. and post-Aug.), Cato, R. R. 3, 6; 22, 2; Col. 4, 30, 4; Vitr. 10, 5: radix concisa in orbiculos, cut in little disks or slices, Plin. 25, 13, 94, 148; Inscr. Orell. 2519.— Esp.,