From Longman Dictionary of Contemporary EnglishGeiger counterGei‧ger count‧er /ˈɡaɪɡə ˌkaʊntə $ -ɡər ˌkaʊntər/ noun [countable] TMan instrument that finds and measures radioactivity
Examples from the Corpus
Geiger counter• Sea-anglers dot the foreshore, their rods like the jittery feelers of crayfish or the dials of a Geiger counter.• Just before each Geiger counter click we see a flash of light from the illuminated electron.• There are various ways of monitoring radiation, the best known being the Geiger counter.• The Geiger counter may not have been properly calibrated.Origin Geiger counter (1900-2000) Hans W. Geiger (1882-1945), German scientist who invented it (with Walter M. Müller) 