n. A shoe for a horse, consisting commonly of a narrow plate of iron bent into a form somewhat resembling the letter U, so as to accommodate itself to the shape of the horse's foot.n. Anything shaped like a horseshoe.n. In zoology: A horseshoe-crab.n. A bivalve mollusk, Lutraria elliptica. Also called clump.n. plural The game of quoits, in which horseshoes are often used for pitching.To provide with horseshoes, or shape like a horseshoe.In architecture, to carry inward at the imposts, as an arch, so as to bring it approximately to the form of a horseshoe.n. Nautical, a composition strap bent in the form of a horseshoe and used for fastening the stem to the keel.