Vocabulary What does 東宮 (とうぐう, touguu) mean? 東宮 (とうぐう, touguu) means crown prince. Quick factsReadingとうぐうRomajitouguuPart of speechnoun 東宮とうぐうtouguucrown prince1noun crown princeAlso written: 春宮Kanji in this word東east宮palace; shrine