-in

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-in

suff.

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.

[Variant of -ine.]

-in

suffix forming nouns

1. indicating a neutral organic compound, including proteins, glucosides, and glycerides insulin digitoxin tripalmitin

2. indicating an enzyme in certain nonsystematic names pepsin

3. (Medicine / Pharmacology) indicating a pharmaceutical substance penicillin riboflavin aspirin

4. indicating a chemical substance in certain nonsystematic names coumarin

[from New Latin -ina; compare -ine²]

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