<p><strong>Noun</strong></p><ul><li>Machinery: A jib crane having a boom hinged near the base of the mast so as to rotate about the mast, for moving a load toward or away from the mast by raising or lowering the boom.</li><li>Also called oil derrick: The towerlike framework over an oil well or the like.</li><li>A boom for lifting cargo, pivoted at its inner end to a ship's mast or kingpost, and raised and supported at its outer end by topping lifts.</li></ul><p><strong>Verb</strong></p><ul><li>(used with or without object)<ul><li>Machinery: Luff.</li></ul></li></ul>