Spinster
A spinster is an older word for an unmarried woman. A word used more often today is "single woman" or bachelorette.
Other meanings
A spinster is also someone who spins yarn from wool using a spinning wheel. Spinsters use the yarn to make clothes like a tailor, seamster, seamstress. One famous spinster is the girl in the story of Rumpelstiltskin.
Spinster Media
The Spinner by William-Adolphe Bouguereau shows a woman hand-spinning using a drop spindle. Fibers to be spun are bound to a distaff held in her left hand.
Monument to Peg Woffington (1720–1760) in St Mary's church, Teddington which describes her marital status.
In 1936, Lambert Pharmacal Co., St. Louis, Mo. advertising Listerine mouthwash blamed halitosis for Edna approaching her 30th birthday, and still being "Often a bridesmaid but never a bride".