jib boom

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jib boom

[′jib ‚büm]
(mechanical engineering)
An extension that is hinged to the upper end of a crane boom.
(naval architecture)
A spar used as an extension of the bowsprit on sailing ships.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

jib boom

A piece which extends the upper end of a boom, 2.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.