hel ‧ i ‧ cop ‧ ter /ˈheləkɒptə, ˈhelɪkɒptə $ -kɑːptər/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Language: French ; Origin: hélicoptère , from Greek heliko- (from helix ; ⇨ ↑ helix ) + pteron 'wing' ]
a type of aircraft with large metal blades on top which turn around very quickly to make it fly SYN chopper