[lip-id, lahy-pid]
noun Biochemistry.
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 proteins and carbohydrates, the chief structural components of living cells.
Also, lipide [lip-ahyd, -id, lahy-pahyd, -pid] .

1920–25; lip- + -id3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lipid or lipide (ˈlaɪpɪd, ˈlɪpɪd, ˈlaɪpɪd, ˈlɪpɪd)
biochem Former name: lipoid any of a large group of organic compounds that are esters of fatty acids (simple lipids, such as fats and waxes) or closely related substances (compound lipids, such as phospholipids): usually insoluble in water but soluble in alcohol and other organic solvents. They are important structural materials in living organisms
[C20: from French lipide, from Greek lipos fat]
lipide or lipide
[C20: from French lipide, from Greek lipos fat]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"organic substance of the fat group," from Fr. lipide, coined 1923 by G. Bertrand from Gk. lipos "fat, grease" (see leave (v.)) + chemical suffix -ide.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

lipid lip·id (lĭp'ĭd, lī'pĭd) or lip·ide (lĭp'īd', lī'pīd')
Any of a group of organic compounds, including the fats, oils, waxes, sterols, and triglycerides, that are insoluble in water but soluble in common organic solvents, are oily to the touch, and together with carbohydrates and proteins constitute the principal structural material of living cells.

lip·id'ic adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
lipid   (lĭp'ĭd)  Pronunciation Key 
Any of a large group of organic compounds that are oily to the touch and insoluble in water. Lipids include fatty acids, oils, waxes, sterols, and triglycerides. They are a source of stored energy and are a component of cell membranes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The triglyceride level is usually included in a lipid panel or coronary risk
These chemicals are usually low water soluble to non-soluble and lipid soluble
Regular physical activity can help control blood lipid abnormalities, diabetes
  and obesity.
Individuals from families with a strong history of early heart attacks should
  have blood tests done to determine lipid levels.
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