Fat noun 1. a natural oily substance occurring in animal bodies, especially when deposited as a layer under the skin or around certain organs. "whales and seals insulate themselves with layers of fat" 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 fats" adjective 1.(of a person or animal) having a large amount of excess flesh. "the driver was a fat wheezing man" 2. large in bulk or circumference. "a fat cigarette" verb ARCHAIC make or become fat. "numbers of black cattle are fatted here"
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