freeboard

American  

[free-bawrd, -bohrd] / ˈfriˌbɔrd, -ˌboʊrd /

noun

1. Nautical.

   1. the distance between the level of the water and the upper surface of the freeboard deck amidships at the side of a hull: regulated by the agencies of various countries according to the construction of the hull, the type of cargo carried, the area of the world in which it sails, the type of water, and the season of the year.

   2. (on a cargo vessel) the distance between the uppermost deck considered fully watertight and the official load line.

   3. the portion of the side of a hull that is above the water.

2. Civil Engineering. the height of the watertight portion of a building or other construction above a given level of water in a river, lake, etc.

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freeboard British  

/ ˈfriːˌbɔːd /

noun

1. the space or distance between the deck of a vessel and the waterline

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Etymology

Origin of freeboard

1670–80; free + board; translation of French franc bord

Example Sentences

Their low freeboard means passengers have little time in an emergency.

From Washington Times • May 5, 2020

“I was saying 2 feet freeboard at the 100-year level a year ago and people were saying, ‘You crazy academic, that’s never going to happen.’

From Slate • Aug. 30, 2018

The ship that was captured on Monday had a low freeboard and was travelling so slowly that it was, he says "almost a sitting duck".

From BBC • Mar. 15, 2017

Andrew Varney, of British-based security firm Port 2 Port Maritime, said the Matrix's low freeboard - the distance between a ship's railings and the water - and slower speed made it vulnerable to being boarded.

From Reuters • May 28, 2013

We had plenty of freeboard, the distance between the water and the gunnel; it would take a mean sea to swamp us.

From "Life of Pi" by Yann Martel