Meaning

noun a soft greasy substance occurring in organic tissue and consisting of a mixture of lipids (mostly triglycerides)

noun a kind of body tissue containing stored fat that serves as a source of energy; it also cushions and insulates vital organs

noun excess bodily weight

originFrom Middle English fat, from Old English fæt (“vat, vessel, jar, cup, casket, division”), from Proto-Germanic *fatą (“vessel”), from Proto-Indo-European *pod- (“vessel”). Cognate with Dutch vat (“barrel, vessel”), German Fass (“barrel, drum”), Swedish fat (“barrel, dish, cask”). See vat.

Etymology from Wiktionary, CC BY-SA 3.0