noun. 
                    A white crystalline substance, C27H45OH, found in animal tissues and various foods, that is normally synthesized by the liver and is important as a constituent of cell membranes and a precursor to steroid hormones. Cholesterol is transported through the bloodstream as different types of lipoproteins, two of which (HDL cholesterol and LDL cholesterol) are routinely measured in blood tests.
                  
                
                  
                    noun. 
                    undefined
                  
                
                  
                    noun. 
                    HDL cholesterol.
                  
                
                  
                    noun. 
                    LDL cholesterol.