/ Dictionary / Index T traveling-wave tube: Meaning and Definition of Find definitions for: trav'eling-wave' tube" Pronunciation: (trav'u-ling-wāv', trav'ling-), [key] — Electronics. Electronics. an electron tube used in microwave communications systems, having an electron beam directed coaxially through a wire helix to produce amplification. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. traveling salesman problem travelled Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language