1. flat knot a square knot used in a reef line
  2. flatness the property of having two dimensions
  3. flatten out become flat or flatter
  4. flatulent generating excessive gas in the alimentary canal
  5. flattened having been flattened
  6. flat coat the first or preliminary coat of paint or size applied to a surface
  7. flatulence a state of excessive gas in the alimentary canal
  8. flatulency a state of excessive gas in the alimentary canal
  9. blood knot a knot used for tying fishing leaders together
  10. flatfoot a foot afflicted with a fallen arch
  11. flight control control from ground stations of airplanes in flight by means of messages transmitted to the pilot electronically
  12. flat-footed with feet flat on the ground; not tiptoe
  13. flute glass a tall narrow wineglass
  14. wild China tree deciduous tree of southwestern United States having pulpy fruit containing saponin
  15. flood control (engineering) the art or technique of trying to control rivers with dams etc in order to minimize the occurrence of floods
  16. litigant a party to a lawsuit
  17. chaetognathous of or relating to arrowworms
  18. flat bone part of the sirloin next to the wedge bone
  19. footcandle a unit of illuminance on a surface that is everywhere 1 foot from a point source of 1 candle
  20. black knot disease of plum and cherry trees characterized by black excrescences on the branches