蹄 is a bound form (b.f.) meaning 'hoof'. It rarely appears alone in modern Chinese; instead it is used as a morpheme in compounds like 猪蹄 (pig trotters), 马蹄 (horse hoof), and the colloquial noun 蹄子 (hoof/trotter). You can use it in food contexts (猪蹄) or animal anatomy (马蹄).