fluorine, F, atomic number 9 - 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 --2is a kind ofchemical element, element; gas; halogen --2is a substance of
farad, F - 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 --3is a kind ofcapacitance unit --3is a part of abfarad --3has parts: millifarad