spinster
noun /ˈspɪnstə(r)/
/ˈspɪnstər/
(old-fashioned, often disapproving)- 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.
Oxford Collocations DictionarySpinster is used before these nouns:- aunt
Word Originlate Middle English (in the sense ‘woman who spins’): from the verb spin + -ster; in early use the term was added to names of women to denote their occupation. The current sense dates from the early 18th cent.