historian

(Internet slang, especially anime and manga fandom) events or things from the past which one wants to whitewash/erase from history (due to it being embarrassing, poorly received, etc.); dark past

study of history

historic, historical / already-happened, past / former, old, traditional

Obsolete spelling of ドイツ (“Germany (a country)”)

(informal) Short for 独身女性 (dokushin josei, “single woman”).

Dokdo, Liancourt Rocks (islands in the East Sea)

Alternative form of 独島 (Dokuto)

(games) sudoku (a type of puzzle)

(obsolete) German spy