colthood|ˈkəʊlthʊd| [f. colt + -hood.] The state of being a colt; the colt stage of life. 1865Mrs. Whitney Gayworthys I. 126 Old Flighty, named in colthood, but long outgrown..her title.1887T. Hardy Woodlanders I. i. 5 Leg-joints, shoulders, and hoofs were distorted by harness and drudgery from colthood.