boom3

noun

• a long pole or rod, in particular.
• a spar pivoting on the after side of the mast and to which the foot of a vessel’s sail is attached, allowing the angle of the sail to be changed.
• [often as modifier] a movable arm over a television or movie set, carrying a microphone or camera:a boom mike
• a long beam extending upward at an angle from the mast of a derrick, for guiding or supporting objects being moved or suspended.
• a floating beam used to contain oil spills or to form a barrier across the mouth of a harbor or river.
• a retractable tube for inflight transfer of fuel from a tanker airplane to another airplane.