(noun) a soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form ; used in coins and jewelry and tableware and photography
(noun) an acronym for emissions of light and very low frequency perturbations due to electromagnetic pulse sources; extremely bright extremely short (less than a msec) electrical flashes forming a huge ring (up to 400 km diameter ) in the ionosphere