-in

1. Neutral chemical compound, especially:
   1. Neutral carbohydrate: inulin.
   2. Protein or protein derivative: albumin.
   3. Lipid or lipid derivative: lecithin.
   4. Enzyme: pancreatin.
   5. Glycoside: chitin.
2. A pharmaceutical: rifampin.
3. An antibiotic: penicillin.
4. Antigen: tuberculin.
5. Variant of -ine² (sense 1).

[Variant of -INE².]

1. Neutral chemical compound: inulin.
2. Pharmaceutical: rifampin.
3. Antibiotic: penicillin.
4. Antigen: tuberculin.
5. Variant of –ine² (sense ).