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Adjective: lighter-than-air  'lI-tu(r) dhun 'ehr
  1. Relating to a balloon or other aircraft that flies because it weighs less than the air it displaces
    "We have been, and are, doing our best to develop the lighter-than-air machine"

See also: light

Encyclopedia: Lighter-than-air

Nearest

light-duty
lighted
light-emitting diode
lighten
lighten up
lightener
lightening
lighter
lighterage
lighterman
lighter-than-air
lighter-than-air craft
light-fingered
light-footed
light-green
light-haired
light-handed
light-handedly
lightheaded
light-headed
light-headedly