Flare is a descriptive term for the angle at which a ship's hull plate or planking departs from the vertical in an outward direction with increasing height. A flared hull typically has a deck

Deck (ship)

A deck is a permanent covering over a compartment or a hull of a ship. On a boat or ship, the primary deck is the horizontal structure which forms the 'roof' for the hull, which both strengthens the hull and serves as the primary working surface...

 area larger than its cross-sectional area at the waterline

Waterline

The term "waterline" generally refers to the line where the hull of a ship meets the water surface. It is also the name of a special marking, also known as the national Load Line or Plimsoll Line, to be positioned amidships, that indicates the draft of the ship and the legal limit to which a ship...

. Most vessels have some degree of flare above the waterline. Advantages of hull flare can include improvements in stability, splash and wash suppression, and dockside

Dock

-In transportation:*Dock , a structure for handling ships**Drydock, a basin that can be flooded and drained to allow a load to come to rest on a dry platform**Ferry slip, a docking facility that receives a ferryboat...

 utility.

Tumblehome

Tumblehome

In ship designing, the tumblehome is the narrowing of a ship's hull with greater distance above the water-line. Expressed more technically, it is present when the beam at the uppermost deck is less than the maximum beam of the vessel....

is the inverse of flare, where the hull becomes narrower with increasing height.