プログレッシブ和英中辞典(第4版)の解説
こうぞく【皇族】
〔個人〕a member of the Imperial family, an Imperial prince [princess]；〔総称〕the Imperial family
皇族の敬称
天皇陛下
His Majesty the Emperor
皇后陛下
Her Majesty the Empress
天皇皇后両陛下
Their Majesties the Emperor and Empress
皇太子殿下
His Imperial Highness the Crown Prince
皇太子妃殿下
Her Imperial Highness the Crown Princess
親王［内親王］殿下
His [Her] Imperial Highness Prince... [Princess...]（▼…に名前を入れて呼ぶ）