A loosely defined term for substances of biological origin that are soluble in nonpolar solvents. They consist of saponifiable lipids, such as @G02647@ (fats and oils) and @P04559@, as well as nonsaponifiable lipids, principally @S06005@.
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1348 [Terms] [Paper]
See also:
White Book, 2nd ed., p. 180 [Terms] [Book]