[-poly-] ruby

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Across
  1. 2. shapes with many sides
  2. 6. many angles
  3. 7. a type of material made from many chemical parts
  4. 8. having many syllables
Down
  1. 1. a lie detector (records many body responses)
  2. 3. a large group of islands in the Pacific ocean
  3. 4. many meanings
  4. 5. a person who speaks many languages