From Longman Dictionary of Contemporary Englishspinsterspin‧ster /ˈspɪnstə $ -ər/ noun [countable] old-fashioned MARRYan unmarried woman, usually one who is no longer young and seems unlikely to marry → bachelor► see thesaurus at married
Examples from the Corpus
spinster• That she should ever marry was not in his mind, though a spinster on the boards would hardly do.• In 1973 Wendy Ellis, poor Wendy, a spinster, died aged thirty-five of liver failure.• As in Ireland, there are many frustrated bachelors and spinsters, and there are frequent late marriages.• Sally lives with her mother and her spinster aunt.• And what about us inveterate spinsters, us permanent bachelors?• There did seem to be a lot of spinsters in the twenties.• A dried-up old spinster like that talking of love!• It had been clear from the start that the spinster had taken an instant dislike to both Ashi and her daughter.• Both my father's sisters were spinsters.Origin spinster (1600-1700) spinster “woman who spins” ((14-20 centuries)), from spin 