O / obstrāgŭlum
noun

obstrāgŭlum

gen. obstrāgŭli · gender neuter · decl. 2nd
a strap, lace, latchet
a strap, lace, latchet, that fastened the sandal to the foot: crepidarum obstragulis, Plin. 9, 35, 56, § 114.