Lipid
Another word for "fat." (Please see the various meanings of Fat.) A lipid is more formally defined as a substance such as a fat, oil or wax that dissolves in alcohol but not in water. Lipids contain carbon, hydrogen and oxygen but have far less oxygen proportionally than carbohydrates. Lipids are an important part of living cells. Together with carbohydrates and proteins, lipids are the main constituents of plant and animal cells. Cholesterol and triglycerides are lipids. Lipids are easily stored in the body. They serve as a source of fuel and are an important constituent of the structure of cells. Lipids include fatty acids, neutral fats, waxes and steroids (like cortisone). Compound lipids (lipids complexed with another type of chemical compound) comprise the lipoproteins, glycolipids and phospholipids. Etymology: Whereas the everyday term "fat" comes from the Old English (from "faett" meaning crammed or adorned), the more scientific term "lipid" comes from the Greek "lipos" which referred to animal fat or vegetable oil. The derivation of a biomedical term from another tongue such as Greek, Latin or French lends it a certain "je ne sais quoi" (something that cannot be easily expressed), a touch of continental class.
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“Fat-soluble,” an operational term describing a solubility characteristic, not a chemical substance, i.e., denoting substances extracted from animal or vegetable cells by nonpolar solvents; included in the heterogeneous collection of materials thus extractable are fatty acid s, glycerides and glyceryl ethers, phospholipids, sphingolipids, long-chain alcohols and waxes, terpenes, steroids, and “fat-soluble” vitamins such as A, D, and E. [G. lipos, fat]
- l. A the glycolipid component of lipopolysaccharide responsible for its endotoxic activity.
- anisotropic l. a l. in the form of doubly refractive droplets.
- anular l. the layer(s) of l. bound to and/or surrounding an integral membrane protein.
- brain l. impure cephalin possessing marked hemostatic action when locally applied.
- compound lipids lipids that can be hydrolyzed under alkali conditions to generate smaller constituents.
- isotropic l. a l. occurring in the form of singly refractive droplets.
- simple lipids SYN: homolipids.
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Long-Term Intervention with Pravastatin in Ischemic Disease [trial]

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lip·id 'lip-əd also lip·ide -.īd n any of various substances that are soluble in nonpolar organic solvents (as chloroform and ether), that with proteins and carbohydrates constitute the principal structural components of living cells, and that include fats, waxes, phospholipids, cerebrosides, and related and derived compounds

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n.
one of a group of naturally occurring compounds that are soluble in solvents such as chloroform or alcohol, but insoluble in water. Lipids are important dietary constituents, not only because of their high energy value but also because certain vitamins and essential fatty acids are associated with them. The group includes fat, the steroid, phospholipid, and glycolipid.

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lip·id (lipґid) any of a heterogeneous group of fats and fatlike substances characterized by being water-insoluble and being extractable by nonpolar (or fat) solvents such as alcohol, ether, chloroform, benzene, etc. All contain as a major constituent aliphatic hydrocarbons. The lipids, which are easily stored in the body, serve as a source of fuel, are an important constituent of cell structure, and serve other biological functions. Lipids may be considered to include fatty acids, neutral fats, waxes, and steroids. Compound lipids comprise the glycolipids, lipoproteins, and phospholipids.

Medical dictionary. 2011.

Look at other dictionaries:

  • lipid — lip id 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… …   The Collaborative International Dictionary of English

  • lipid — (n.) organic substance of the fat group, from Fr. lipide, coined 1923 by G. Bertrand from Gk. lipos fat, grease (see LIPO (Cf. lipo )) + chemical suffix IDE (Cf. ide) …   Etymology dictionary

  • lipid — {{/stl 13}}{{stl 8}}rz. mnż I, D. u, Mc. lipididzie {{/stl 8}}{{stl 7}} jeden z grupy naturalnych związków organicznych, obejmującej tłuszcze właściwe, woski i in.; lipidy wchodzą w skład błon komórkowych <ang.> {{/stl 7}} …   Langenscheidt Polski wyjaśnień

  • lipid — ► NOUN Chemistry ▪ any of a class of fats that are insoluble in water and include many natural oils, waxes, and steroids. ORIGIN from Greek lipos fat …   English terms dictionary

  • lipid — [lip′īd΄, lip′idlip′id] n. [ LIP(O) + ID] any of a group of organic compounds consisting of the fats and other substances of similar properties: they are insoluble in water, soluble in fat solvents and alcohol, and greasy to the touch, and are… …   English World dictionary

  • lipid — /lip id, luy pid/, n. Biochem. 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… …   Universalium

  • Lipid — Structures of some common lipids. At the top are oleic acid[1] and cholesterol.[2] The middle structure is a triglyceride composed of oleoyl, stearoyl, and palmitoyl chains at …   Wikipedia

  • Lipid — Lipide (von griechisch λίπος lípos „Fett“) ist eine Sammelbezeichnung für ganz oder zumindest größtenteils wasserunlösliche (hydrophobe) Naturstoffe, die sich dagegen aufgrund ihrer geringen Polarität sehr gut in hydrophoben beziehungsweise… …   Deutsch Wikipedia

  • lipid — UK [ˈlɪpɪd] / US noun [countable] Word forms lipid : singular lipid plural lipids biology one of a group of chemical compounds that do not dissolve in water. Lipids include oils and fats …   English dictionary

  • lipid — lip|id [ˈlıpıd] n [Date: 1900 2000; : French; Origin: lipide, from Greek lipos fat ] technical one of several types of ↑fatty substances in living things, such as fat, oil, or ↑wax …   Dictionary of contemporary English

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