The definition of dustproof is something that is resistant to dust.
A plastic cover you put over your furniture that repels dust is an example of something that is dustproof.
keeping out dust
(comparative more dustproof, superlative most dustproof)
- Resistant to dust.
dust + -proof
- It is, therefore, further recommended (a) that the milk be rapidly cooled or chilled, as the lower the temperature the less do the bacteria multiply, (b) that contamination during railway transit be avoided by dustproof locked milk cans.