The term FAT, LIQUID PART OF can be solved by two crossword solutions: OLEIN (5 letters) and OLEINE (6 letters). OLEIN is a type of glyceride that is composed of a mixture of fatty acids. It is a liquid at room temperature and is used in the production of soaps, detergents, and cosmetics. OLEINE is a type of glyceride that is composed of a single fatty acid. It is also a liquid at room temperature and is used in the production of margarine, shortening, and other food products.