water-plane

A ship's water-plane is clearly visible as it sits in the harbor.

Definition

1. Noun:
   • A plane surface coinciding with the waterline of a ship: In naval architecture, "water-plane" refers to the horizontal plane at the water's surface where the hull of a vessel intersects the water. This plane is used to calculate a ship's stability and buoyancy.
   • A body of water considered as a flat surface: In geography or hydrography, "water-plane" can denote the flat, level surface of a lake, sea, or other expanse of water.

Usage Examples

• Noun:
  • The naval architect calculated the water-plane area to determine the ship's stability. (The horizontal area at the waterline was measured.)
  • From the airplane, the lake appeared as a smooth water-plane. (The lake looked like a flat, level surface of water.)

Advanced Usage

• "water-plane coefficient": A dimensionless ratio used in ship design, representing the area of the water-plane divided by the length and beam of the vessel.
  • A higher water-plane coefficient indicates a more stable hull form.

Variants and Related Words

• Waterline (n): The line where the surface of the water meets the side of a ship.

  • The waterline was clearly marked on the hull. (The line indicating the water level.)

• Waterplane (n): A less common spelling, often used interchangeably with "water-plane" in technical contexts.

Synonyms

• Water surface: The topmost layer of a body of water.
• Water level: The height or plane of the water's surface.

Related Idioms

• On an even keel: (Not directly related to "water-plane," but used in similar nautical contexts) meaning stable and balanced.
  • The ship sailed on an even keel. (The ship was stable and not listing.)