That gives him mild pause, because who doesn't know what biology is? But he supposes that maybe the study of magic has put scientific advancement on the back burner, for Shade-Seeker's folks. "Biology is the study of living organisms, subdivided into a hell of a lot of categories like anatomy and behavior, that sort of thing. Xeno's a prefix that used to mean alien, and it kind of still does, we just phrase it nicer and say it refers to non-humans instead."