The term 'KIND OF FLUID' can be solved by two crossword solutions: WIPER (5 letters) and AMNIOTIC (8 letters). WIPER fluid is a type of fluid used in windshield wipers to help keep the windshield clean. It is usually composed of water, detergents, and other additives. Amniotic fluid is the liquid that surrounds and cushions a fetus in the uterus during pregnancy. It is composed of water, proteins, lipids, carbohydrates, and electrolytes.