Lewis Short
(adjective) : pectŏrālis, e, pectus
* Of or belonging to the breast, breast-, pectoral: pectorale os,the breast-bone,Cels. 8, 1: tunicula,Amm. 14, 9, 7: cinctum,App. M. 11, p. 261, 36: fascia,Vulg. Isa. 3, 24 (Hier. in loc., Vulg. Jer. 2, 32).—Hence
* Subst.: pectŏrāle, is, n., a breast-plate, Varr. L. L. 5, § 115 Müll.; Plin. 34, 7, 18, § 43.
Charlton T. Lewis, Charles Short, A Latin Dictionary