1. A spar or pole extending outward from the stern of a ship to hold the mizzen sail or other rigging.
Usage: nautical; also spelled 'bumkin'

Examples

• The sailor secured the rope to the boomkin at the ship's stern.
• The boomkin extended several feet beyond the hull to support the sail.
• Damage to the boomkin required immediate repair before the vessel could set sail.
• The crew carefully balanced the rigging on the boomkin to maintain stability.