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Term: Image: Definition:
Jet Boat
A boat powered by an engine with a water-pump used to create propulsion.
Jib
Triangular sail projecting ahead of the mast.
Keel
The bottom-most portion or longitudinal centerline of a hull.
Ketch
A sailboat similar in appearance to a yawl with a tall main mast and a shorter mizzen mast ahead of the rudder post.
Lifeline
Safety lines on deck that are grabbed to prevent falling overboard.
LOA
Length overall; the distance between the most forward part of the boat and the most aft part.
Luff
The leading edge of a sail.
Mainsail
The largest regular sail on a sailboat.

Mast
Vertical spar that supports sails.
Megayacht
A large, luxurious yacht, typically longer than 100 feet
Mizzen Mast
A shorter mast located aft of the main mast on a yawl or ketch.
Monohull
A boat with a single hull.
Motorsailer
A hybrid boat that has sails and powerful engines.
Motoryacht
A large powerboat greater than 40 feet with luxurious interior accommodations for long-range cruising
Multihull
A boat with more than one hull, such as a catamaran or trimaran.
Outboard Bracket
Support device for mounting outboard engines that extends aft of the transom.
Outboard Motor
Internal combustion engine mounted at the transom that incorporates motor, driveshaft and propeller.
Outdrive
The lower unit of a stern-drive motor that houses the drive gears and to which the propeller fastens.
Outrigger
Poles designed to spread out fishing lines and keep them from tangling while trolling.
Pilot House
A fully enclosed helm compartment.