/ Dictionary / Index C companion ladder: Meaning and Definition of Find definitions for: compan'ion lad"der Pronunciation: [key] — Naut. Naut. an inboard ladder or stair, as in a companionway. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. companion cell companion piece 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