| ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷ noun
or geiger-mül·ler counter | ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷ — -ˈmyü]lə(r)-, -ˈmi], -ˈmu̇], -ˈmə]
Usage: usually capitalized G&M
Etymology: after Hans Geiger died 1945 German physicist and W. Müller, 20th century German physicist, its inventors
1. : geiger-müller tube
2. : an instrument consisting of a Geiger-Müller tube and the electronic equipment used in conjunction with it to record (as by a series of clicks) the momentary current pulsations in the tube gas