a form of cathode-ray tube.
Origin of Crookes tube
First recorded in 1880–85; after Sir W. Crookes
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a type of cathode-ray tube in which the electrons are produced by a glow discharge in a low-pressure gas
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012