The Collaborative International Dictionary
Jib \Jib\ (j[i^]b), n. [Named from its shifting from side to side. See Jib, v. i.., Jibe.]
(Naut.) A triangular sail set upon a stay or halyard extending from the foremast or fore-topmast to the bowsprit or the jib boom. Large vessels often carry several jibs; as, inner jib; outer jib; flying jib; etc.
(Mach.) The projecting arm of a crane, from which the load is suspended.
One that jibs, or balks; a jibber.
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A stationary condition; a standstill.
Jib boom (Naut.), a spar or boom which serves as an extension of the bowsprit. It is sometimes extended by another spar called the flying jib boom. [Written also gib boom.]
Jib crane (Mach.), a crane having a horizontal jib on which a trolley moves, bearing the load.
Jib door (Arch.), a door made flush with the wall, without dressings or moldings; a disguised door.
Jib header (Naut.), a gaff-topsail, shaped like a jib; a jib-headed topsail.
Jib topsail (Naut.), a small jib set above and outside of all the other jibs.
The cut of one's jib, one's outward appearance. [Colloq.]
--Sir W. Scott.
Wiktionary
n. (context nautical English) A spar attached to the outboard end of a bowsprit or flying jib boom with an additional stay to increase sail area.
Usage examples of "jib boom".
He had been working on the forecastle with the bosun's party when a great wave had reared high above the jib boom and had hurled him clean over the rail like a piece of canvas.
The measurements of a cut board were the scantlings, the squared-off rear was the transom, the piece of timber used to extend the bowsprit a jib boom, and the splice of timbers a scarph.
Lotus leaned over, close hauled on the starboard tack, swinging her jib boom like a pointer toward the invisible horizon, and the unknown ship.
It was always a time of bustle and purpose, and on this day there was not a man jack aboard who did not know that the ship, which was their home, their way of life, their reason for being, would soon be turning her jib boom towards the west, and eventually to England.