'flattop' definitions:

Definition of 'flattop'

(from WordNet)
noun
A closely cropped haircut; usually for men [syn: crew cut, flattop]
noun
A large warship that carries planes and has a long flat deck for takeoffs and landings [syn: aircraft carrier, carrier, flattop, attack aircraft carrier]

Definition of 'flattop'

From: GCIDE
  • flattop \flat"top`\ n. (Mil.) An aircraft carrier. [PJC] Flatulence