The Collaborative International Dictionary of English v.0.48:

Helicopter \Hel"i*cop`ter\, n. [NL., fr. Gr. "e`lix, "e`likos, a
   spiral + ptero`n a wing.]
   a heavier-than-air aircraft whose lift is provided by the
   aerodynamic forces on rotating blades rather than on fixed
   wings. Contrasted with fixed-wing aircraft.
   [PJC]

The Collaborative International Dictionary of English v.0.48:

Helicopter \Hel"i*cop`ter\, v. i.
   to travel in a helicopter.
   [PJC]

The Collaborative International Dictionary of English v.0.48:

Helicopter \Hel"i*cop`ter\, v. t.
   to transport in a helicopter.
   [PJC]

WordNet (r) 3.0 (2006):

helicopter
    n 1: an aircraft without wings that obtains its lift from the
         rotation of overhead blades [syn: helicopter, chopper,
         whirlybird, eggbeater]