Uni, Bi, Tri, Quad

1234567891011121314151617181920
Across
  1. 4. A dinosaur with three horns - two long horns above the eyes and one short horn on the nose
  2. 6. A horse-like fabled animal that has one horn growing out of the middle of its forehead
  3. 10. To create four times as much or as many of something
  4. 11. Having two different colors
  5. 12. One of a kind; unusual or rare
  6. 14. To cut into three parts
  7. 16. A vehicle with three wheels
  8. 18. A race that combines three activities - swimming, bicycling, and running
  9. 20. A plane figure in geometry that has four sides (including square, rectangle, rhombus, parallelogram, and trapezoid)
Down
  1. 1. A muscle group consisting of four muscles that is located along the front of the thigh
  2. 2. The ability to speak four languages
  3. 3. Having only one cell
  4. 5. An airplane with two pairs of wings
  5. 7. Able to speak two different languages
  6. 8. A one-wheeled vehicle on which the rider sits and pedals
  7. 9. A four-sided enclosure, usually surrounded by buildings
  8. 13. Moving in only one direction
  9. 15. A vehicle with two wheels
  10. 17. Happening every two months
  11. 19. Three related plays or novels