Color enhanced transmission electron micrograph showing adipose cell. Fat droplets. Rat. Magnification 61,000x. Lipid cell, any of a group of organic compounds that are greasy to the touch, insoluble in water, and soluble in alcohol and ether: lipids comprise the fats and other esters with analogous properties and constitute, with proteins and carbohydrates, the chief structural components of living cells. Adipose, relating to or consisting of animal fat. Adipose tissue is a type of connective tissue consisting of adipose cells, which are specialized to produce and store large fat globules. These globules are composed mainly of glycerol esters of oleic, palmitic, and stearic acids. Adipose tissue is the main reservoir of fat in animals.