/ Dictionary / Index L Lenard tube: Meaning and Definition of Find definitions for: Le'nard tube" Pronunciation: [key] — Electronics. Electronics. an early cathode-ray tube having at the end opposite the cathode a window of thin glass or metal allowing cathode raysto pass out into the atmosphere. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Lenard Lenca Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language