lighter-than-air
light er-than-air ▶adjective [ attrib. ] relating to or denoting a balloon or other aircraft weighing less than the air it displaces, and so flying as a result of its own buoyancy.
lighter-than-air ▶adjective relating to or denoting a balloon or other aircraft weighing less than the air it displaces, and so flying as a result of its own buoyancy.
The Wordsmith Dictionary
The Wordsmith Dictionary