1. a hairstyle in which the hair is cut very short on the sides and back and left longer on top, with the top hair standing upright and cut flat across
2. an aircraft carrier
Usage: informal; military

Examples

• He got a flattop haircut before joining the military.
• The barber specialized in classic flattops and crew cuts.
• His flattop made him look very neat and professional.
• The flattop was a popular hairstyle in the 1950s.
• The fighter jets landed on the flattop after their mission.
• The Navy’s newest flattop can carry over 80 aircraft.
• Sailors could see the flattop approaching on the horizon.