1. [US, informal] A large warship that carries planes and has a long flat deck for takeoffs and landings
   "The flattop launched fighter jets for the mission";
   - aircraft carrier, carrier, attack aircraft carrier
    
2. A closely cropped haircut; usually for men or boys
   "The new recruit got a regulation flattop at the barber shop";
   - crew cut, butch, buzz cut [N. Amer], butch cut

1. Having a flat or flattened upper surface
   "The flat-top mesa dominated the landscape";
   - flat-topped

Derived forms: flattops

See also: topped

Type of: combat ship, haircut, war vessel, warship

Encyclopedia: Flattop