Lewis & Short

pĕtĭmen, ĭnis, n., perh. a sore on the shoulder of beasts of burden or draught (ante-class.): petimina in umeris jumentorum ulcera: eo nomine autem et inter duos armos suis quod est aut pectus solitum appellari, testatur Naevius, Fest. p. 209 Müll.; cf.: petimina in umeris jumentorum ulcera, Paul. ex Fest. p. 208 ib.