Noun
waterplane (plural waterplanes)
(nautical) The horizontal cross section of a vessel on a level with the waterline.
About 70 small waterplan area ships whose hulls have a smaller cross section at the waterplane than below the surface exist. Source: Internet
Any twin-hull SWA ship is called a small waterplane area twin hull (SWATH). Source: Internet
A trisec can have a minimal waterplane area and minimal motions in waves, resulting in more effective motion control. Source: Internet
More often the term small waterplane area hull means a hull with an underwater gondola and strut(s) that connect the gondola to the above-water platform. Source: Internet
The distance between the design waterplane and the bottom of the above-water platform (wet deck) is called the vertical clearance. Source: Internet