impervious to or free of dust.

1865–70; dust + -proof

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
It's dustproof, so neither beach nor desert will damage it.
They are waterproof and dustproof and can be used to protect lenses and film.
The bags are waterproof and dustproof and you can pocket several on every
  flight when the cabin crew are not looking.
Friction-fit cylindrical dustproof strikes with circular face plate may be used
  only where metal thresholds occur.
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