(poly)

123456789
Across
  1. 3. Shapes with many sides
  2. 5. Having many syllables
  3. 6. Many meanings
  4. 7. A natural synthetic material
  5. 9. A large group of islands in the Pacific Ocean
Down
  1. 1. A type of material made from many chemical parts
  2. 2. A person who speaks many languages
  3. 4. A shape with many sides
  4. 5. A lie detector (records many body responses)
  5. 8. Simultaneous use of two or more contrasting pieces of music