/ Dictionary / Index P Plimsoll line: Meaning and Definition of Find definitions for: Plim'soll line" Pronunciation: (plim'sul, -sōl), [key] — Naut. Naut. See(def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plimsoll Plimsoll mark Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language