noun
Usage: usually capitalized C
Etymology: after Sir Wm. Crookes
: a vacuum tube evacuated to a pressure of about .04 mm of mercury for demonstrating the properties of cathode rays
noun
Usage: usually capitalized C
Etymology: after Sir Wm. Crookes
: a vacuum tube evacuated to a pressure of about .04 mm of mercury for demonstrating the properties of cathode rays
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012