noun
: a screen (as of cardboard or glass) one face of which is coated with a salt (as calcium tungstate) that emits light under the action of X rays or cathode rays
noun
: a screen (as of cardboard or glass) one face of which is coated with a salt (as calcium tungstate) that emits light under the action of X rays or cathode rays
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012