قوس

qaus, s.f. A bow; arc (of a circle); curve (of an arch); the sign of Sagittarius:—qaus-ě-andarūnī, The interior curve (of an arch), intrados;—the concave side:—qaus-ě-berūnī, The exterior curve (of an arch), extrados;—the convex side:—qaus-ě-quzaḥ, s.f. The rainbow:—qaus-numā, adj. Bowed; curved, etc. (=qausī, q.v.).