What is triacylglycerol

There are 3 hydroxyl groups in a glycerol molecule. If all the three groups are forming ester  linkage with fatty acids, the resulting compound is called a triacylglycerol or a triglyceride. Structure of a triacylglycerol is shown:

The compound shown here is tristearoylglycerol, also known as glycerol tristearate. This is a triester of glycerol with stearic acid. Many other fatty acids either saturated or unsaturated and having varying chain length are present in triacylglycerols.