Definitions for "Chambered"
(pith). With hollow cavities separated by discs or plates.
(pith) – pith divided crosswise by numerous plates or membranes.  The pith looks ladder-like when the twig is cut lengthwise.
said of pith which is interrupted by hollow spaces. Chambered pith Non-chambered pith
having compartmental chambers; "a spiral chambered seashell"
Keywords:  gun, shell
Having a chamber or chambers; as, a chambered shell; a chambered gun.