Etymology

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Across
  1. 2. LIII
  2. 6. 567
  3. 8. Person with six siblings of the exact same age.
  4. 9. Quinqu-
  5. 10. Di-
  6. 12. Literally means "three angles".
  7. 15. Milli- or mill-
  8. 16. 94
  9. 17. Meaning one, derived from Greek
  10. 18. Said to have 100 feet
Down
  1. 1. Prime suspect
  2. 3. Hemi-
  3. 4. I was studying the northern hemisphere, this much of the Earth.
  4. 5. Two people can also be called this.
  5. 7. 19
  6. 8. Combining form of the word meaning "one and a half"
  7. 10. XXI
  8. 11. One form
  9. 13. Ambi-
  10. 14. "Eighth month"