FILET OF FISH is a type of seafood dish that is made by cutting a fillet from the side of a fish and then cooking it. It is usually served with a sauce or other accompaniment, such as lemon juice or tartar sauce. The term 'filet of fish' is derived from the French word for 'SLICE, ' which is 'filet.' The crossword solution for this term is SOLE, which is a type of flatfish found in the Atlantic Ocean.