Sealed or constructed so that no dust can penetrate; dust-sealed with no gaps or openings.
Compound of 'dust' and 'tight' (from Old English 'tyht', meaning to pull or press firmly). This technical term emerged in industrial and mechanical contexts where precision dust exclusion was critical.
Engineers use 'dusttight' when 'dustproof' isn't strict enough—it implies an absolute seal with zero tolerance for dust. Critical instruments and sterile environments depend on dusttight construction.
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