The phrase "starch flour" refers to a type of flour that is made from starch, which is a carbohydrate found in many plants. It is often used as a thickening agent in cooking and baking. Full definition
Heat the egg mixture over medium heat, stirring constantly, and slowly pour the potato starch flour in. (outside-oslo.com)
Instead, I prefer using rice flour, combined with tapioca starch flour and potato starch. (tacanow.org)
One cup of resistant starch flour contains 8 grams of fiber, that's more than twice the amount of fiber found in your regular white flour. (healthybodydaily.com)