[-poly-] Riley

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Across
  1. 1. a large group of islands in the pacific
  2. 4. a type of material made from many chemicals
  3. 6. producing or involving many sounds or voices
  4. 7. many meanings
Down
  1. 1. having many syllables
  2. 2. a person who speaks many languages
  3. 3. a lie detector (records many body responses)
  4. 5. an institution of higher education offering courses at degree level or below, especially in vocational subjects
  5. 6. a rhythm which makes use of two or more different rhythms simultaneously
  6. 7. shapes with many sides