#1 fat a. having an (over)abundance of flesh; "he hadn't remembered how fat she was". wn
#2 fat n. a soft greasy substance occurring in organic tissue and consisting of a mixture of lipids (mostly triglycerides); "pizza has too much fat". wn
#3 fat s. having a relatively large diameter; "a fat rope". wn
#4 fat n. [adipose tissue, 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". wn
#5 fat v. [fatten, flesh out, fill out, plump, plump out, fatten out, fatten up] make fat or plump; "We will plump out that poor starving child". wn
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