Learner's definition of CHOLESTEROL
a substance that is found in the bodies of people and animals
Did your doctor check your cholesterol?
She is on medication to lower her cholesterol. = She is on medication to lower her cholesterol level. [=to lower the amount of cholesterol in her blood]
My doctor told me that high cholesterol [=having too much cholesterol in your blood] can lead to serious medical problems such as heart attacks and strokes.