Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
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., the nave of a wheel, Vitr. 10, 2, 9.