Plural of deluster (substances or agents that remove shine), or third-person singular present tense of the verb 'deluster' (to apply a delusterant).
From 'deluster' + '-s' (regular pluralization or verb conjugation). The base word originated in 20th-century textile chemistry.
English's regularity is on display here—whether 'delusters' is a noun or verb depends entirely on context, but the spelling never changes. This flexibility lets us use root words in multiple ways without special forms.
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