BOOM

boom. Boom, n. a spar to extend a sail, a chain or cable across a river

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Boom (bo͞om), n. [[D. boom tree, pole, beam, bar. See Beam.]] 1. 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.
2. 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.
3. 3. A pole with a conspicuous top, set up to mark the channel in a river or harbor.
4. 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.
5. 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.
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.