1 A raised wooden frame consisting of two uprights and a cross-piece on which the skid booms of a square-rigged ship rested. See also booms.
2 A temporary wooden structure, also known as a boom crutch, erected on the counter of small fore-and-aft-rigged sailing craft on which the main boom is stowed and secured when the vessel is at anchor or lying on a mooring.
3 Inverted U-shaped iron or steel frames fitted in pairs on one or both sides of a trawler and carrying a large sheave to take the trawl warps. They were colloquially known as the ‘the galluses’.