fat -- (a soft greasy substance occurring in organic tissue and consisting of a mixture of lipids (mostly triglycerides); "pizza has too much fat")
adipose tissue, fat, fatty tissue -- (a kind of body tissue containing stored fat that serves as a source of energy; it also cushions and insulates vital organs; "fatty tissue protected them from the severe cold")
fatness, fat, blubber, avoirdupois -- (excess bodily weight; "she disliked fatness in herself as well as in others")