Definition of "alienator"

To one like Elia, whose treasures are rather cased in leather covers, than closed in iron coffers, there is a class of alienators more formidable than that which I have touched upon; I mean, your borrowers of books—those mutilators of collections, spoilers of the symmetry of shelves, and creators of odd volumes.

1820 December, Charles Lamb, “The Two Races of Men”, in The London Magazine, volume 2, number 12, page 624