Sentence:  Dr. Wilson C. Grant , of the Veterans ' Administration Hospital , Coral Gables , Florida , and the University of Miami School of Medicine , set out to discover if avocados , because of their high content of unsaturated <WSD>fatty</WSD> acids , would reduce the cholesterol of the blood in selected patients . 
Meaning of the word marked with <WSD> tags:  any of a class of aliphatic monocarboxylic acids that form part of a lipid molecule and can be derived from fat by hydrolysis; fatty acids are simple molecules built around a series of carbon atoms linked together in a chain of 12 to 22 carbon atoms