nun

card 1 of 10 · context meaning

What does 'nun' mean in this sentence?

Why last night, as Colonel Kill'em, Sir William Weezy, Lord Frederick Foretop, and I were carelessly sliding the Ranelagh round, picking our teeth, after a damn'd muzzy dinner at Boodle's, who should trip by but an abbess, well known about town, with a smart little nun in her suite.