Lewis Short
bŏiae (noun F) : bos
* A collar for the neck, κλοιός (orig. of leather; hence the name; but later of wood or iron),Fest. p. 29; Isid. Orig. 5, 27, 12: boia κλοιός, Gloss. Vet.: pedicae boiae,Plaut. As. 3, 2, 5: attrita boiis colla, Prud. Psych. praef. 34.—For boiam terere, v. Boii fin.
Charlton T. Lewis, Charles Short, A Latin Dictionary