Amber is called elektron in Greek, and electrum in Latin, so Gilbert decided to refer to the phenomenon by the adjective electricus, giving rise to the modern terms "electric" and "electricity".
O ámbar en grego denomínase elektron e electrum en latín, por iso Gilbert referiuse ao fenómeno co adxectivo electricus e o nome electricitas, que darían paso aos termos modernos eléctrico e electricidade.