Washed and ground pure white chalk (calcium carbonate) used for polishing dental materials.
The food item you are referring to is likely the “flounder.” It is a type of fish that is found in the Atlantic coastal waters and is known for its tender, delicate texture. Flounder has lean white flesh and a relatively mild and subtle flavor compared to other types of fish. It is a versatile fish that can be prepared in a variety of ways, such as sautéed, baked, or grilled. Flounder is a popular seafood item in many parts of the world and is commonly found in seafood markets and restaurants.
A fish about 12 to 14 inches in length, with a gray back and silver underside. It is sometimes mistaken for a small haddock, but can be distinguished by the fact that it has no dark marks on the back. They are caught on the east coast of North America as far south as Virginia in the United States. As whiting does not possess a great deal of flavor, it needs to be accompanied by a good sauce, though when in prime condition it can be fried and simply served with lemon. Whiting is an easily digested fish and is therefore useful for those on diets. It has a good protein content and supplies some vitamin D.