Fluor
FLU'OR, noun [Low Latin from fluo, to flow.]
1. A fluid state.
2. Menstrual flux. [Little Used in either sense.]
3. In mineralogy, fluate of lime. fluor spar is the foliated fluate of lime. This mineral, though sometimes massive, is almost always regularly crystallized. Its crystals present most frequently the form of a cube, often perfect, sometimes truncated on all its edges by planes, which form with the sides of the cube an angle of 135 degrees. The colors are very numerous and beautiful.
The flutate of lime, fluor was so named from its use as a flux for certain ores.