bi·cam·er·al 
(bī-kămər-əl)
(bī-kămər-əl)adj.
1. Composed of or based on two legislative chambers or branches: a bicameral legislature.
2. Medicine Composed of or having two chambers, as an abscess divided by a septum.
[BI-1 + Latin camera, chamber; see CHAMBER + -AL1.]
bi·camer·al·ism n.