The Collaborative International Dictionary of English v.0.48:

Biliary \Bil"ia*ry\ (b[i^]l"y[.a]*r[y^]; 106), a. [L. bilis
   bile: cf. F. biliaire.] (Physiol.)
   Relating or belonging to bile; conveying bile; as, biliary
   acids; biliary ducts.
   [1913 Webster]

   Biliary calculus (Med.), a gallstone, or a concretion
      formed in the gall bladder or its duct.
      [1913 Webster]

WordNet (r) 3.0 (2006):

biliary
    adj 1: relating to or containing bile [syn: bilious,
           biliary]
    2: relating to the bile ducts or the gallbladder