Technology / Aviation / Seaplane: A water-based aircraft with a boat-hull fuselage, often amphibious.The term is also used generically to define a similar Flying Boat and a pontoon FLOATPLANE.
Technology / Aviation / Sponson: A short, winglike protuberance on each side of a seaplane fuselage to increase lateral stability. MORE
Technology / Aviation / Amphibian: A SEAPLANE or FLOATPLANE with retractable wheels for use on land, as well. The latter spelling was used in the '20s and '30s but has since fallen out of favor. MORE
Technology / Aviation / Floatplane: A water-based aircraft with one or more mounted pontoons, as differentiated from a hulled SEAPLANE [Flying Boat], but often used generically. MORE