[f. BILE + -IN.] A gummy pale yellow mass, formerly considered to be the principal constituent of the bile.
1849–52. Todd, Cycl. Anat. & Phys., IV. 844/2. Bilin and biliary colouring matter.
1872. Huxley, Phys., v. 122. Bilin … is a mixture of two acids in combination with soda.
