frail, fract, frag = break, shatter

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Across
  1. 2. so delicate that it could break easily; easily damaged
  2. 3. geometry that creates broken patterns out of a smaller version of a design
  3. 5. a broken rule; a violation
  4. 7. a break in a part of the body
  5. 8. describes something that is broken into pieces
Down
  1. 1. to bend light so it looks like it is broken
  2. 2. being easily broken or destroyed
  3. 4. to vote
  4. 6. an incomplete sentence; a break in a sentence
  5. 7. a part of a whole; a broken piece of something