1. flat cap a flat woolen cap with a stiff peak
  2. flute glass a tall narrow wineglass
  3. flatcar freight car without permanent sides or roof
  4. field glass a small refracting telescope
  5. field scabious perennial having bluish-lilac flowers
  6. flatboat a flatbottom boat for carrying heavy loads
  7. flatness the property of having two dimensions
  8. flat coat the first or preliminary coat of paint or size applied to a surface
  9. flat-top having a flat or flattened upper surface
  10. flattop a closely cropped haircut; usually for men
  11. flytrap a trap for catching flies
  12. fly the coop flee; take to one's heels; cut and run
  13. voltaic pile battery consisting of voltaic cells arranged in series
  14. flats footwear with no heel
  15. flaps a movable airfoil that is part of an aircraft wing
  16. field capacity the maximum amount of water that a particular soil can hold
  17. flare pass a short forward pass to a back who is running toward the sidelines
  18. foolscap a size of paper used especially in Britain
  19. flatulence a state of excessive gas in the alimentary canal
  20. flat bone part of the sirloin next to the wedge bone