Definition of "een"

And eke with fatnesse swollen were his eyne

1590, Edmund Spenser, “Book I, Canto IV”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie, stanza 21

But the sight of her eyes was not a thing to forget. John Dodds said they were the een of a deer with the Devil ahint them; and indeed, they would so appal an onlooker that a sudden unreasoning terror came into his heart, while his feet would impel him to flight.

1902, John Buchan, The Outgoing of the Tide