Two booms, half-yards, or iron spars projecting on each side before the cat-heads; they are for spreading the guys of the jib-boom, instead of having a spritsail-yard across. In many vessels the sprit-sail (then termed spread-yard) is lashed across the forecastle so as to rest before the cat-heads on the gunwale, and the guys rove through holes bored in it, and set up in the fore-channels.