1743, from Modern Latin adiposus "fatty," from Latin adipem (nominative adeps, genitive adipis) "soft fat of animals, fat, lard," from Greek aleipha "unguent, fat," related to lipos "grease, fat" (see leave (v.)). Change of -l- to -d- "prob. due to Umbrian influence" [Klein]. But it could as well be a native Italic formation from the same roots, *ad-leip-a "sticking onto."
Relating to or consisting of animal fat.♦ Adipose tissue is a type of connective tissue consisting of adipose cells, which are specialized to produce and store large fat globules. These globules are composed mainly of glycerol esters of oleic, palmitic, and stearic acids. Adipose tissue is the main reservoir of fat in animals.