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Term: Image: Definition:
V-Drive
Propulsion system where the drive shaft initially runs forward into a gear box and then runs aft and down through the hull. The driveline forms a V-shape with the gear box at the pivot point.
Waterline
The intersection of the hull and the surface of the water.
Zinc Anodes (Zincs)
Small pieces of zinc that attach to metal boat and engine components to help protect them from corrosion due to electrolysis, an effect caused when dissimilar metals are placed in a saltwater solution.
Anchor
An anchor is a heavy item that is dropped down into the water, touching the bottom of the body of water and securing the vessel. Usually, the anchor is made up of a ring at one end for attaching the line (rope), while the other end of the anchor has two metal pieces jutting out to the sides to help grasp the floor of the body of water.
Fenders
Made of plastic or rubber, the fenders prevent a vessel from moving onto a pier. They prevent damage to the boat as well as the pier should the two come into contact with each other.
Gunnel
Also known as the gunwale, this is an edge along the side of a boat. It works to add to the structure and provide strength to the overall design.
Superstructure
Any type of structure that is above deck is considered the superstructure of a boat. It is important to note that the rigging is not considered part of the superstructure.
Stuffing box
On a boat having an inboard motor that turns a shaft attached to an external propeller, the shaft passes though a stuffing box, also called a "packing box" or "stern gland". The stuffing box prevents sea water from entering the boat's hull. In many small fiberglass boats, for example, the stuffing box is mounted inboard near the point the shaft exits the hull. The "box" is a cylindrical assembly, typically of bronze, comprising a sleeve threaded on one end to accept adjusting and locking nuts.
Lower Unit Gearcase Gear Housing
It provides mechanical support for the moving components, a mechanical protection from the outside world for those internal components, and a fluid-tight container to hold the lubricant that bathes those components.
Sail Drive
A saildrive is a transmission system for a boat whose inboard engine has a horizontal output shaft. The saildrive's input shaft is therefore also horizontal. 
Coach Roof
The roof of the cabin on a small boat.
Clam Shell Vent
clamshell vents are commonly used to vent bilges or as intake air supplements for active vents.