Breadcrumb Home > Dictionary > Index L lighthouse tube: Meaning and Definition of Find definitions for: light'house tube" Pronunciation: [key] — Electronics. Electronics. a vacuum tube with the electrodes arranged in parallel layers closely spaced, giving a relatively high-power output at high frequencies. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Lighthouse Point Light in August* TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: fatuous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language