The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
in
SUFFIX:
1. Neutral chemical compound, especially: a. Neutral carbohydrate: inulin.b. Protein or protein derivative: albumin.c. Lipid or lipid derivative: lecithin.d. Enzyme: pancreatin.e. Glycoside: chitin.2. A pharmaceutical: rifampin.3. An antibiotic: penicillin.4. Antigen: tuberculin.5. Variant of ine2 (sense 1).