noun
: an ionization chamber designed to respond to passage through it of fast-moving ionizing particles and usually connected to some device (as a Geiger counter) for counting the particles
noun
: an ionization chamber designed to respond to passage through it of fast-moving ionizing particles and usually connected to some device (as a Geiger counter) for counting the particles
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012