What is "stabilisers"

Usage examples of "stabilisers".

It felt as heavy as a stage fire curtain, no wonder he needed stabilisers with all that topweight on.

A cloudless night, with the sky crowded with the usual impossible number of stars, a soft, warm wind blowing out of the south, a moderate cross swell running, but no match for our dennybrown stabilisers that could knock twenty-five degrees off a thirty-degree roll without half trying.

The campari, in spite of her stabilisers, was rolling through a ten to-fifteen-degree arc, which meant that there must be a pretty heavy and steep beam sea or swell running.

Just had new stabilisers fitted in the Clyde - we got back up here only two days ago - and it seems like a good day to try them out.

One is whether Sir Anthony really was down at some Clyde shipyard a few days ago having stabilisers fitted -a big job few yards would tackle in a yacht that size.