ˈlau̇]rə̇tsən-, ˈlȯ], ˈlä]\ noun
Usage: usually capitalized L
Etymology: after Charles C. Lauritsen died 1968 and Thomas Lauritsen b 1915 American physicists born in Denmark, who designed it
: an electroscope in which the sensitive element is a quartz fiber used in precise measurements of ionizing radiation