Etymology Crossword

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Across
  1. 1. one
  2. 3. one billion bytes
  3. 7. mythical creature with one horn
  4. 8. figure with 8 sides
  5. 9. twice
  6. 11. four children born at one birth
  7. 14. figure with 7 sides
  8. 15. two-wheeled vehicle
  9. 16. 100
  10. 17. noon
  11. 18. half of a sphere
  12. 19. sea creature with 8 arms
Down
  1. 1. one million tons
  2. 2. XV
  3. 4. train that rides on one track
  4. 5. 1,000 years
  5. 6. figure with five sides
  6. 10. trimester
  7. 12. 10 years
  8. 13. athletic contest with 3 events