| Plimsoll's mark () A mark conspicuously painted on the port side of all British sea-going merchant vessels, to indicate the limit of submergence allowed by law |
| plimsoll | a light gym shoe with a rubber sole and a canvas top |
| load line Plimsoll line Plimsoll mark Plimsoll | waterlines to show the level the water should reach when the ship is properly loaded |