boom

³boom

noun

Definition of BOOM

1

: a long spar used to extend the foot of a sail

2

a : a chain or line of connected floating timbers extended across a river, lake, or harbor (as to obstruct passage or catch floating objects) b : a temporary floating barrier used to contain an oil spill

3

a : a long beam projecting from the mast of a derrick to support or guide cargo b : a long more or less horizontal supporting arm or brace (as for holding a microphone)

4

: a spar or outrigger connecting the tail surfaces and the main supporting structure of an aircraft

Origin of BOOM

Dutch, tree, beam; akin to Old High German boum tree — more at beam

First Known Use: 1627