Definition of spinster noun from the Oxford Advanced American Dictionary

 

spinster

 noun
noun
NAmE//ˈspɪnstər//
 
(old-fashioned)(often disapproving)
 
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a woman who is not married, especially an older woman who is not likely to marry The sisters were to remain spinsters for the rest of their lives. This word should not now be used to mean simply a woman who is not married. compare bachelor
spinsterhood
 
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NAmE//ˈspɪnstərˌhʊd//
 
noun [uncountable] For most women, marriage used to bring a higher status than spinsterhood.
See the Oxford Advanced Learner's Dictionary entry: spinster