thornback

Etymology
From ; equivalent to.

Noun

 * 1) Any animal with a thorny back, especially marine animals, such as:
 * 2) The , a species of ray in the north-eastern Pacific Ocean.
 * 3) The  or , a species of ray in the Atlantic Ocean.
 * 4) The , a fish endemic to Australia.
 * 5)  A woman over a certain age (variously 26 or 30) who has never married, older than a spinster.
 * 6) * 1710, Isaac Bickerstaff (pseudonym), A Good husband for five shillings, or Esquire Bickerstaff's Lottery, quoted in 2016, Amy M. Froide, Silent Partners: Women As Public Investors During Britain's Financial Revolution, 1690-1750, Oxford University Press (ISBN 9780198767985), page 46:
 * [A] society of honest gentlemen [is holding a lottery] for the benefit of all single ladies, widows, maids, or thornbacks