uni prefix crossword puzzle

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Across
  1. 4. a horse-like fabled animal that has one horn growing out of the middle of it's forehead
  2. 6. join together in one group
  3. 7. having only one cell
  4. 8. a one-piece leotard and tights combination
Down
  1. 1. a one-wheeled vehicle on which the rider sits and pedals
  2. 2. one sided
  3. 3. an instance of saying the same words or sounds at the same time, a group that sounds like one
  4. 5. moving in only one direction
  5. 6. one group
  6. 7. one of a kind, unusual or rare