quadrupole

== English == === Etymology === From quadru- + pole. === Noun === quadrupole (plural quadrupoles) (physics) A distribution of either electric charge or magnetization equivalent to two dipoles that point in opposite directions. (physics) A magnet with two north poles and two south poles, used to focus a beam of particles. ==== Derived terms ==== ==== Related terms ==== quadrupolar octupole ==== Translations ==== === See also === quadripole