metallic bond: a chemical bond in which electrons are shared over many nuclei and electronic conduction occurs
force: (physics) the influence that produces a change in a physical quantity
manichaeism: a religion founded by Manes in the third century; a synthesis of Zoroastrian dualism between light and dark and Babylonian folklore and Buddhist ethics and superficial elements of Christianity; spread widely in the Roman Empire but had largely died out by 1000