The Collaborative International Dictionary of English v.0.48:
Bilestone \Bile"stone`\, n. [Bile + stone.] A gallstone, or biliary calculus. See Biliary. --E. Darwin. [1913 Webster]WordNet (r) 3.0 (2006):
bilestone n 1: a calculus formed in the gall bladder or its ducts [syn: gallstone, bilestone]