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.
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-mark
- After Samuel Plimsoll (1824–1898), British merchant and shipping reformer
From American Heritage Dictionary of the English Language, 5th Edition
- From Samuel Plimsoll, Bristol merchant and member of Parliament, promoter of the Merchant Shipping Act.