chest Copy link Outline I. For keeping things inII. The cavity in the body containing the heart and lungs1. thōrax, ācis, m.2. praecordĭa, orum • chest: I. For keeping things in: arca, armārium, cista, etc.: v. box. Phr.: the military c., aerarium militare, Tac.: v. treasury. II. The cavity in the body containing the heart and lungs: 1. thōrax, ācis, m.: Plin.: Cels. 2. praecordĭa, orum: the diaphragm separates the c. from the belly, transversum septum a praecordiis uterum diducit, Cels.: v. also breast, bosom.