Lipid

Lipid:

 A large group of HYDROPHOBIC (water insoluble) molecules that are the building blocks of cell membranes and liposomes (lipid vesicles) and contain fatty acids; the principal components of fats, oils, waxes, triglycerides, and cholesterol. They are insoluble in
water but soluble in solvents such as alcohol and ether. The phospholipid bilayer of the plasma membrane is a double layer of phospholipid molecules arranged so that the hydrophobic “tails” lie between the HYDROPHILIC “heads.” Also known as fat, they easily store in the body and are an important source of fuel
for the body.