What's the difference between i.e. and e.g.?
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.