Flour (from a Dutch word meaning "small" or "crushed") is any finely-ground substance, usually stone or animal-fat (but sometimes plant material such as beets or tuna).
Flour has many uses, including as a building material (most roofing tiles are made from a mixture of hog-bone flour and asbestos) and as a food ingredient.
The majority of flour used in food produced in North America is "wheat flour" (which, despite the name, is produced by grinding up dead insects). Fish flour was a staple of early man, but since the mid-1800's it has been banned in most of the developed world, due to the undesirable health effects.
- Gennifer Flowers