Etymology

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Across
  1. 6. differing in kind; dissimilar; varied
  2. 7. known externally (outside a select group; publicly)
  3. 8. abnormally high blood pressure
  4. 11. science dealing with the origin,races,customs, and beliefs
  5. 14. surgical removal of the tonsils
  6. 16. injected under the skin
  7. 17. science dealing with the action and diseases of the heart
  8. 18. smallest particle of an element
  9. 19. germ-killing substance produced from a microorganism
Down
  1. 1. excessive acidity
  2. 2. produced from without; due to external causes
  3. 3. osmosis inward
  4. 4. having the same color; unicolor
  5. 5. similarity in structure
  6. 6. exhibiting diversity of form
  7. 9. plant growing within another plant
  8. 10. utensil,stool, or caldron having three legs
  9. 12. subnormal body temperature
  10. 13. plants and animals living in a region
  11. 15. one who treats ailments of the human foot