It means knight in French.

_{[Not that she expects him to know where or what France is.]}

Mm, you're quite right. _{[The second part has her raising a brow, interested.]} Wouldn't you have to go to quite the effort to find willing blood donors for such a thing? I've quite the appetite but I won't say no if you want to give me blood in any capacity.

_{[Because she's fat.]}