caprylic acidPronunciation: /kaˈprɪlɪk/Definition of caprylic acid noun [mass noun] Chemistry a liquid fatty acid present in butter and other fats. Chemical formula: CH3(CH2)6COOH Origin: mid 19th century: from Latin caper, capr-, 'goat' + -yl + -iccaprylic acid in other Oxford dictionaries Definition of caprylic acid in the US English dictionary