| a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine | the 6th letter of the Roman alphabet |
| | the capacitance of a capacitor that has an equal and opposite charge of 1 coulomb on each plate and a voltage difference of 1 volt between the plates |
| | a degree on the Fahrenheit scale of temperature |
| | a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite |