Wordnet 3.0
ADJECTIVE (1)
1. 
 having compartmental chambers; 
- Example: "a spiral chambered seashell"
The Collaborative International Dictionary of English v.0.48:
Chamber \Cham"ber\, v. i. [imp. & p. p. Chambered; p. pr. &
   vb. n. Chambering.]
   1. To reside in or occupy a chamber or chambers.
      [1913 Webster]
   2. To be lascivious. [Obs.]
      [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Chambered \Cham"bered\, a.
   Having a chamber or chambers; as, a chambered shell; a
   chambered gun.
   [1913 Webster]
WordNet (r) 3.0 (2006):
chambered
    adj 1: having compartmental chambers; "a spiral chambered
           seashell"