One way to hold this word: it is dust plus -er, the thing that deals with dust. Picture a cloth going across a grey shelf and coming away grey itself. Most of the senses are that job in different shapes — a cloth in the hand, a felt block on a , a loose coat taking the dust so your shirt does not, a person hired to do the wiping. And because -er only names the , it can also point the other way: the wind that throws the dust about is a duster too.
From the word’s history
From dust plus the agent suffix -er, which comes through Middle English -ere and Old English -ere; the suffix names the one that does the action, whether a person or a thing.
來源把它拆成 dust 加上表示「做這個動作的人或東西」的字尾 -er，這個字尾經由中古英文 -ere、古英文 -ere 一路傳下來。所以 duster 字面上就是「處理灰塵的那一個」，人或工具都可以。
Wiktionary, English entry 'duster' (packet source_ref kaikki:3f6f69a190036ae4:1257841025)
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