NCIt definition : A glycerol backbone covalently bound to a phosphate group in one position, and fatty
acids in the 2nd and 3rd positions. Phosphatidic acids thus have a polar head and
apolar tails, and occur in cell membranes throughout nature.;
Alternative definition : CRCH: Simplest form of dietary phospholipid consisting of glycerol bound to two fatty
acids and a phosphate group.;