Another interesting etymology (they all are)
A spinster was originally defined as a woman who spins, which was the act of “…converting fibres into thread or yarn by hand-labour or by machinery.” Later on from the 17th Century it was recognized for women who were still unmarried.
Online Etymology Dictionary
mid-14c., “female spinner of thread,” from Middle English spinnen “spin fibers into thread” (see spin (v.)) + -stere, feminine suffix (see -ster). Unmarried women were supposed to occupy themselves with spinning, hence the word came to be “the legal designation in England of all unmarried women from a viscount’s daughter downward” [Century Dictionary] in documents from 1600s to early 1900s, and by 1719 the word was being used generically for “woman still unmarried and beyond the usual age for it.”
Spinster, a terme, or an addition in our Common Law, onely added in Obligations, Euidences, and Writings, vnto maids vnmarried. [John Minsheu, “Ductor in Linguas,” 1617]
Strictly in reference to those who spin, spinster also was used of both sexes (compare webster, baxter, brewster) and so a double-feminine form emerged, spinstress “a female spinner” (1640s), which by 1716 also was being used for “maiden lady.” Related: Spinsterhood.
Also, there is the abbreviation Spin
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Pronunciation: Brit. /spɪn/, U.S. /spɪn/
Frequency (in current use):
Etymology: Abbreviation of spinster n.
An unmarried lady.
1842 C. Ridley Let. Mar. in U. Ridley Cecilia (1958) vii. 90 Mrs. Dixon, a good lady..who was sitting in a very tidy, very hot room with two old spins as companions.
1872 ‘Aliph Cheem’ Lays of Ind (1876) 193 I’m going to rhyme about A most unhappy spin.
1872 ‘Aliph Cheem’ Lays of Ind (1876) 200 O spins. ! be warned ere yet too late.
1888 B. M. Croker Diana Barrington xxiii There were all the Gurrumpore spins in their beautiful new frocks!