Meaning of load-line mark

load'-line mark"

Pronunciation: (lōd'līn"), [key]
— Naut. Naut.
  1. any of various marks by which the allowable loading and the load line at load displacement are established for a merchant vessel; a load line. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.