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 . Also called 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.