a. [ Gr. li`pos fat. ] (Chem.) Pertaining to, or derived from, fat. The word was formerly used specifically to designate a supposed acid obtained by the oxidation of oleic acid, tallow, wax, etc. [ 1913 Webster ]

n. [ Gr. li`pos fat. ] (Chem., Biochem.) Any of a variety of oily or greasy organic compounds found as major structural components of living cells; they are insoluble in water but soluble in organic solvents such as alcohol and ether, and include the common fats, cholesterol and other steroids, phospholipids, sphingolipids, waxes, and fatty acids; some of the lipids, together with proteins and carbohydrates, form an essential structural component of living cells, as in the cell walls and membranes. The term lipid refers to its solubility in nonpolar solvents, and has no significance with regard to chemical structure.
Syn. -- lipide, lipoid. [ WordNet 1.5 ]

n. Same as lipid.
Syn. -- lipid, lipoid. [ WordNet 1.5 ]

n. (Med.) Same as lipemia. [ PJC ]

a. (Med.) Serving to reduce the concentration of lipid, such as cholesterol, in the blood; -- of medications, such as Mevinolin, that are used especially to reduce blood cholesterol, as a preventive measure against heart disease. [ PJC ]

n. (Med.) A disorder of lipid metabolism, whether congenital or acquired. [ PJC ]

a. (Chem.) Lipic. [ 1913 Webster ]