(aircraft, nautical) Any aircraft capable of taking off from, and alighting on the surface of water.

plural of seaplane

(obsolete) a ship designed to tend to the needs of seaplanes, floatplanes and flying boats at sea, for resupply, refueling, sometimes including catapult launch

plural of seaplane tender

A type of warship, a form of seaplane tender and an early variety of aircraft carrier, which carries seaplanes onboard, and can launch and retrieve them, as well as tend to them.

plural of seaplane carrier