This list is a clear illustration of why it's better to read Infinite Jest on the iPad book reader, where dictionary definitions are a tap away, than in dead-tree format. Because I'm only 2/3 through and I can't guarantee that he hasn't found a way to use the word "exergue" in a non-coin-related sentence. Probably in a footnote. Which, by the way, is hyperlinked in the iBooks version.
http://www.slate.com/id/2250784
(Teaser: conchoidal, corvee, demulcent, exergue, gramnvirous, etc etc etc).