The crossword solution for the term LIPID is FAT, which is an acronym for 'Fatty Acid Triglycerides'. Lipids are a group of organic compounds that are insoluble in water and soluble in organic solvents. They are composed of fatty acids and glycerol, and are important components of cell membranes and hormones. Fatty acid triglycerides are the most common type of lipid, and are composed of three fatty acid molecules attached to a glycerol backbone.