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- 2 Chemistry any of a group of natural esters of glycerol and various fatty acids, which are solid at room temperature and are the main constituents of animal and vegetable fat: some 40 per cent of our daily calories are derived from dietary fatsCompare with oil.
adjective (fatter, fattest)
verb (fats, fatting, fatted)archaic
Old English fǣtt 'well fed, plump', also 'fatty, oily', of West Germanic origin; related to Dutch vet and German feist