It's all Greek to me!

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Across
  1. 1. kidney also
  2. 4. beyond; between; transition
  3. 6. nerve
  4. 7. form
  5. 8. month
  6. 12. one thousandth
  7. 13. death
  8. 14. many
  9. 15. thread; filament
  10. 16. less
  11. 17. many also
Down
  1. 2. pit; kernel; little nut
  2. 3. membrane
  3. 4. a passage
  4. 5. kidney
  5. 6. new
  6. 7. change
  7. 8. middle
  8. 9. small
  9. 10. a part
  10. 11. name
  11. 16. muscle