D defs.my
Entry 1 sense Webster, 1913

Hydro-aëroplane

· Hy·dro-a·ër·o·plane · IPA
01 An aëroplane with a boatlike or other understructure that enables it to travel on, or to rise from the surface of, a body of water by its o…
  1. 1.
    An aëroplane with a boatlike or other understructure that enables it to travel on, or to rise from the surface of, a body of water by its own motive power; -- now usually referred to as a seaplane.(Aëronautics) [obsolescent] Also: seaplane