Monocarboxylic is an organic compound with only one carboxyl functional group (-COOH) attached to a hydrocarbon chain. Some synonyms for this word include carboxylic acid, monocarboxylate, aliphatic monocarboxylic, and fatty acid. The term "carboxylic acid" is more commonly used in chemistry and biochemistry, while "fatty acid" is often used in the context of lipids and nutrition. The prefix "mono-" indicates that there is only one carboxyl group in the molecule, distinguishing it from dicarboxylic or polycarboxylic compounds. Monocarboxylic acids play a crucial role in metabolic pathways and are used in the synthesis of many important molecules in biology and industry.