Meanings
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1
noun
dated and often disparaging: an unmarried woman, especially one regarded as past the usual age for marriage
The census described her as a spinster living with two sisters.
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2
noun
historical: a woman whose occupation was spinning thread or yarn
The household employed a spinster to turn the prepared wool into yarn.
Thesaurus
Etymology
From Middle English spynnestere, 'a woman who spins,' formed from spin + the feminine agent suffix -ster. Because spinning was a common livelihood for unmarried women, the occupational term became a legal and social label for an unmarried woman. The modern use often sounds dated or insulting.