E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Spouse (Spouze, 1 syl.)
means one whom sponsors have answered for. In Rome, before marriage, the friends of the parties about to be married met at the house of the womans father to settle the marriage contract. This contract was called sponsalia (espousals); the man and woman were spouses. The contracting parties were each asked, An spondes (Do you agree?), and replied Spondeo (I agree).
Spouse of Jesus. Our seraphic mother, the holy Teresa, born at Avila in 1515, is so called in the Roman Catholic Church.