1. 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. <mechanics> 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. A pole with a conspicuous top, set up to mark the channel in a river or harbor.

4. <astronomy> 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. 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.

Origin: D. Boom tree, pole, beam, bar. See Beam.

(01 Mar 1998)

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