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Definitions of F:
noun: the 6th letter of the Roman alphabet
noun: 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
noun: a degree on the Fahrenheit scale of temperature
noun: 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