Comes from the Old English faett meaning to cram or adorn. A slang term for obese or adipose. In chemistry, fats are compounds formed from chemicals called fatty acids. These fats compose a greasy, solid material found in animal tissues and in some plants. Fats are the major component of flabby material of our bodies, commonly known as blubber.
FAT
Meaning of FAT in English
English dictionary of medicine. Английский словарь медицины. 2012