Uni, Bi, Tri, and Quad Review

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Across
  1. 2. a one-wheeled vehicle
  2. 3. happening every two weeks
  3. 4. to cut into four equal parts
  4. 8. a two-footed creature
  5. 9. a figure in geometry that has four sides
  6. 13. moving only in one direction
  7. 15. a three legged stool, table, or stand
  8. 16. able to speak three different languages
Down
  1. 1. a group of three people or things
  2. 2. having only one cell
  3. 3. able to speak two different languages
  4. 5. an animal with four feet
  5. 6. one of four babies born at the same time
  6. 7. the ability to speak four languages
  7. 8. an airplane with two pairs of wings
  8. 10. three related plays or novels
  9. 11. happening every two months
  10. 12. to cut into three parts
  11. 13. to join together in one group
  12. 14. a horse-like animal that has one horn