| Ouka's Dictionary|
|Purpose||Defines and explains colloquialisms|
|Owner(s)||Roseamanelle Ouka Barsburg|
Ouka's Dictionary is a dictionary that Roseamanelle Ouka Barsburg had with her when she first met Teito Klein. it is a dictionary of colloquialisms. Ouka is implied to often carry it around with her, as when Ouka showed it to Teito, Kururu remarked "A book like that again" upon seeing it. However, it did not appear again after Teito and Ouka's first meeting; the reason is unknown.