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See also:FAT (O.E. fdett; the word is See also:common to See also:Teutonic See also:languages, cf. Dutch See also:vet, Ger. Fett, &c., and may be ultimately related to See also:Greek Irian, and =apos, and See also:Sanskrit pivan) , the name given to certain See also:animal and See also:vegetable products which are oily solids at See also:ordinary temperatures, and are chemically distinguished as being the glyceryl See also:esters of various fatty acids, of which the most important are stearic, palmitic, and oleic; it is to be noticed that they are non-nitrogenous . See also:Fat is a normal constituent of animal See also:tissue, being found even before See also:birth; it occurs especially in the See also:intra-See also:muscular, the abdominal and the subcutaneous connective tissues . In the vegetable See also:kingdom fats especially occur in the seeds and fruits, and sometimes in the roots . Physiological subjects concerned with the See also:part played by fats in living animals are treated in the articles CONNECTIVE TISSUE4; See also:NUTRITION; See also:CORPULENCE; METABOLIC DISEASES . The fats are chemically similar to the fixed See also:oils, from which they are roughly distinguished by being solids and not liquids (see OILs) . While all fats have received See also:industrial applications, foremost importance must be accorded to the fats of the domestic animals—the See also:sheep, cow, ox and See also:calf . These, which are extracted from the bones and skins in the first operation in the manufacture of See also:glue, are the raw materials of the See also:soap, See also:candle and See also:glycerin See also:industries . |
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