Definition of "leachour"

Where feeling one cloſe couched by her ſide / She lightly lept out of her filed bedd, / And to her weapon ran, in minde to gride / The loathed leachour.

1590, Edmund Spenser, “Book III, Canto I”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie, page 408