quadrupole

quad ru pole |ˈkwädrəˌpōl ˈkwɑdrəpoʊl | ▶noun Physics a distribution of electric charge or magnetization consisting of four equal monopoles, or two equal dipoles, arranged close together with alternating polarity and operating as a unit. • a device using such an arrangement directed at one point to focus beams of subatomic particles.

quadrupole

quadrupole |ˈkwɒdrʊpəʊl | ▶noun Physics a distribution of electric charge or magnetization consisting of four equal monopoles, or two equal dipoles, arranged close together with alternating polarity and operating as a unit. • a device using a quadrupole arrangement directed at one point to focus beams of subatomic particles.