Etymology

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Across
  1. 4. A seat with a back, intended for one person
  2. 5. Round object, compact spherical body
  3. 8. Gesture or motion of the hand
  4. 9. Place of instruction
  5. 10. Of or pertaining to a system
  6. 11. Actual, solid; particular; denoting a substance
  7. 12. Outer upper covering of a house or other building
Down
  1. 1. Narrow valley between cliffs
  2. 2. Board, square panel or plank
  3. 3. Relation of incidents
  4. 4. Machine to measure and indicate time mechanically
  5. 6. A book containing either all or the principal words of a language
  6. 7. Body of water surrounded by land