S / sectārĭus
adjective hapax

sectārĭus

fem. sectāria · neut. sectārium
gelded; castrated; bellwether
gelded, castrated: vervex, Plaut. Capt. 4, 2, 40 (but Fest. p. 336 Müll.: sextarius vervex, qui gregem agnorum praecedens ducit, i.e. bellwether, from secta).