[Plimsoll mark] n [Samuel Plimsoll d. 1898 Eng. shipping reformer] (1884): a load line or a set of load-line markings on an oceangoing cargo ship--called also Plimsoll line
PLIMSOLL MARK
Meaning of PLIMSOLL MARK in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012