English words of Ancient Greek origin (German bonus!)

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Across
  1. 1. study of nature
  2. 2. triangle with three equal sides
  3. 4. a low voice
  4. 6. a small world
  5. 9. traditional or correct
  6. 10. skin doctor
  7. 11. love of wisdom
  8. 13. without a solid shape
  9. 16. a very old piece of furniture
  10. 18. study of triangles
  11. 20. study of the mind
  12. 21. the New Stone Age
  13. 22. my signature
Down
  1. 1. a false name
  2. 3. the study of cultures
  3. 5. something in the wrong time
  4. 6. belief in one God
  5. 7. of two different kinds
  6. 8. distance across a circle
  7. 12. study of animale
  8. 13. building designer
  9. 14. practice of having multiple wives
  10. 15. eight-tentacled aquatic creature
  11. 17. a large nose
  12. 19. an exaggeration