Spin|ne|rin, die; -, -nen: w. Form zu Spinner (1, 2).
1. Facharbeiter in einer Spinnerei (Berufsbez.). (Duden)
Main Entry: spin·ster
1 : a woman whose occupation is to spin
2 a archaic : an unmarried woman of gentle family b : an unmarried woman and especially one past the common age for marrying
3 : a woman who seems unlikely to marry http://m-w.com/cgi-bin/dictionary?book=Dictio...
NOUN: 1. A woman who has remained single beyond the conventional age for marrying. 2. A single woman. 3. A person whose occupation is spinning
The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Oxford Dict of E:
... in early use the word was appended to names of women to denote their occupation. The current sense [derogatory term] dates from the early 18th century.
1362, "female spinner of thread," from M.E. spinnen (see spin) + -stere, feminine suffix. Spinning commonly done by unmarried women, hence the word came to denote "an unmarried woman" in legal documents from 1600s to early 1900s, and by 1719 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] http://www.etymonline.com/index.php?search=sp...