Definition of SET THEORY. : a branch of mathematics or of symbolic logic that deals with the nature and relations of sets. â set theoretic adjective. See set theory defined for kids. ADVERTISEMENT.
Broadly, the term lipid is encompasses fats (including saturated, monoglyceride, diglyceride and triglyceride), waxes, sterols, phospholipids in the membranes of cells and fat soluble vitamins. Lipid is a basic term representing a molecule that is fat soluble (vs. water soluble).
A lipid is a non-soluble molecular organic compound comprised of hydrogen and carbon. As far as their purpose in the human body goes, lipids are of crucial importance for both energy storage and cell membrane development. Plants and animals alike contain lipids which they depend on for energy. Gram for gram, a lipid contains more than twice the amount of energy found in carbohydrates. In a body that weighs around 150lbs, around 22lbs of this weight will on average be the bodyâs lipid content.