Fat, also known as adipose tissue, is a type of macronutrient and a critical component of the human diet. Chemically, fats are composed of molecules called triglycerides, which consist of three fatty acids attached to a glycerol molecule. Fats are a concentrated source of energy and serve various essential functions in the body.

Unit 2,

Reference: Oxford Concise Colour Medical Dictionary (7th Edition, Kindle Edition) Oxford University Press 2020 ISBN-13: 978-0198836629, p1461