His anger against her found vent in coarse railing at her paramour, whose name and voice and features offended his baffled pride: a priested peasant, with a brother a policeman in Dublin and a brother a potboy in Moycullen.
There are no more uses of "paramour" in the book.
Show samples from other sources
She doesn’t believe in divorce, but she does believe in paramours.
Yes, they were admirers, paramours, sweethearts.
Ransom Riggs -- Miss Peregrine’s Home for Peculiar Children