any very large complex molecule; found only in plants and animals

a soft greasy substance occurring in organic tissue and consisting of a mixture of lipids (mostly triglycerides)

glyceride occurring naturally in animal and vegetable tissues; it consists of three individual fatty acids bound together in a single large molecule; an important energy source forming much of the fat stored by the body

a slippery or viscous liquid or liquefiable substance not miscible with water

any of various compounds composed of fatty acids and phosphoric acid and a nitrogenous base; an important constituent of membranes

any of various substances of either mineral origin or plant or animal origin; they are solid at normal temperatures and insoluble in water