/ Dictionary / Index T trunk line: Meaning and Definition of Find definitions for: trunk' line" Pronunciation: [key] a major long-distance transportation line. trunk (def. 8). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trunk hose trunk piston Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language