"brown fat." YourDictionary, n.d. Web. 17 October 2018. <http://www.yourdictionary.com/brown-fat>.
brown fat. (n.d.). Retrieved October 17th, 2018, from http://www.yourdictionary.com/brown-fat
One of two types of fatty tissue in mammals, especially in newborn infants and hibernating animals, that is composed of dark-colored cells containing numerous mitochondria and lipids, which are converted into body heat.