Comparative form of dusty; more covered with dust or more likely to produce dust than something else.
Comparative form of 'dusty' (from 'dust' + '-y') formed by adding '-er'. 'Dusty' has been in English since the 1300s.
People often mispronounce 'dustier' as having two separate vowel sounds, but native speakers naturally compress it to 'DUS-tyer'—it's a great example of how English pronunciation evolves to be more efficient!
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