(organic chemistry, especially in combination) Any unsaturated carboxylic acid

(organic chemistry) An organic acid involved in the isomerisation of citrate to isocitrate in the citric acid cycle.

(organic chemistry) The imino acid NH₂=CH₂COOH derived from acetic acid; any N-derivative of this compound

(organic chemistry) The monoamide of maleic acid

(organic chemistry) Either of two isomeric carboxylic acids, analogous to benzoic acid, derived from naphthalene

(medicine) A synthetic veterinary antibiotic related to quinoline.

(organic chemistry) Any of several isomeric conjugated polyunsaturated fatty acids found in the seeds of some trees

(organic chemistry) Any carboxylic acid that contains an allene group

(organic chemistry) Any carboxylic acid that contains an alkyne group

(organic chemistry) The allenyl carboxylic acid CH₂=C=CH-COOH