Boom iron

Boom Boom (b[=oo]m), n. [D. boom tree, pole, beam, bar. See {Beam}.] 1. (Naut.) A long pole or spar, run out for the purpose of extending the bottom of a particular sail; as, the jib boom, the studding-sail boom, etc. [1913 Webster]

2. (Mech.) A long spar or beam, projecting from the mast of a derrick, from the outer end of which the body to be lifted is suspended. [1913 Webster]

3. A pole with a conspicuous top, set up to mark the channel in a river or harbor. [Obs.] [1913 Webster]

4. (Mil. & Naval) A strong chain cable, or line of spars bound together, extended across a river or the mouth of a harbor, to obstruct navigation or passage. [1913 Webster]

5. (Lumbering) A line of connected floating timbers stretched across a river, or inclosing an area of water, to keep saw logs, etc., from floating away. [1913 Webster]

{Boom iron}, one of the iron rings on the yards through which the studding-sail booms traverse.

{The booms}, that space on the upper deck of a ship between the foremast and mainmast, where the boats, spare spars, etc., are stowed. --Totten. [1913 Webster]