fat

²fat

noun

Definition of FAT

1

: animal tissue consisting chiefly of cells distended with greasy or oily matter—see brown fat

2

a : oily or greasy matter making up the bulk of adipose tissue b : any of numerous compounds of carbon, hydrogen, and oxygen that are glycerides of fatty acids, are the chief constituents of plant and animal fat, are a major class of energy-rich food, and are soluble in organic solvents (as ether) but not in water c : a solid or semisolid fat as distinguished from an oil

3

: the condition of fatness : obesity