Lexicon Urthus is an alphabetical dictionary for the complete Urth Cycle by Gene Wolfe: The Shadow of the Torturer; The Claw of the Conciliator; The Sword of the Lictor; The Citadel of the Autarch; the sequel Urth of the New Sun; the novella Empires of Foliage and Flower; the short stories "The Cat," "The Map," and "The Old Woman Whose Rolling Pin Is the Sun"; and Gene Wolfe's own commentaries in The Castle of the Otter. The first edition was nominated for a World Fantasy Award. This second edition, available for the first time in paperback, includes 300 new entries. When the first edition was published, Science Fiction Age said: "Lexicon Urthus makes a perfect gift for any fan of [Wolfe's] work, and from the way his words sell, it appears that there are many deserving readers out there waiting." Gary K. Wolfe, in Locus, said: "A convenient and well researched glossary of names and terms. . . . It provides enough of a gloss on the novels that it almost evokes Wolfe's distant future all by itself. . . . It can provide both a useful reference and a good deal of fun." Donald Keller said, in the New York Review of Science Fiction: "A fruitful product of obsession, this is a thorough . . . dictionary of the Urth Cycle. . . . Andre-Driussi's research has been exhaustive, and he has discovered many fascinating things . . . [it is] head-spinning to confront a myriad of small and large details, some merely interesting, others jawdropping."
