propanoic acid

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A colourless liquid with a sharp unpleasant odour; produced by the bacterial breakdown of fatty acids and therefore found in sweat and some cheese.
• noun organic chemistry The short chain aliphatic carboxylic acid, CH3CH2COOH, used as a preservative, and in the manufacture of many chemical compounds.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a liquid fatty acid found in milk and sweat and in fuel distillates