Plimsoll markPlim·soll mark
a line or set of lines on the hull of a merchant ship, showing the depth to which it may legally be loaded
Origin of Plimsoll markafter Samuel Plimsoll (1824-98), Eng advocate of legislation against overloading vessels
Any of a set of lines on the hull of a merchant ship that indicate the depth to which it may be legally loaded under specified conditions. Also called load line, Plimsoll line.
Origin of Plimsoll markAfter Samuel Plimsoll, (1824–1898), British merchant and shipping reformer.
(plural Plimsoll marks)
From Samuel Plimsoll, Bristol merchant and member of Parliament, promoter of the Merchant Shipping Act.