What is the definition or description of: lipid?

Fats: Lipids are fats. A common example of lipids refer to blood fats - cholesterol and triglycerides (tg). These lipids are carried in the circulation by various lipoprotein particles such as tg rich vldl and cholesterol rich LDL and hdl. Tg is used to estimate vldl concentration, while the cholesterol carried in LDL and HDL (ldl-c and hdl-c) is used to estimate LDL and HDL particle concentrations.

Lipids: Are fats that are found in the blood stream.