A Muscle is a Little Mouse?!

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Across
  1. 2. The mythological king who couldn't reach the fruit or drink
  2. 6. The first letter of the Greek alphabet
  3. 8. A word that means awesome or stylish but originally meant a bit cold
  4. 10. Invented by Edward Jenner and used today to protect us from some illnesses
  5. 11. The language from which ‘berserk’ comes
  6. 12. Tempt a person with something they can’t have
  7. 13. The word for the evil spirit in a nightmare
Down
  1. 1. The study of the origin of words
  2. 3. Time spent alone when we have a dangerous illness that is easily spread
  3. 4. Little mice in our arms!
  4. 5. Latin word meaning cow
  5. 7. To be in a wild rage
  6. 9. Someone who is wise