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皇弟 (こうてい) Japanese meaning | Kotomora

皇こう弟てい

Meanings

1

noun

younger brother of an Emperor

Formal, historical, or imperial-household term. Not used for ordinary siblings.

皇こう弟てい殿でん下かが式しき典てんに出しゅっ席せきされた。
His Imperial Highness the Emperor's younger brother attended the ceremony.

Kanji

皇emperor
弟younger brother, faithful service to elders

Similar words

皇こう太たい子し
皇太子 is the Crown Prince (heir apparent), while 皇弟 is specifically the Emperor's younger brother, not necessarily the heir.
弟おとうと
弟 is the ordinary word for 'younger brother'; 皇弟 is restricted to imperial context.

Etymology

Compound of 皇 (imperial) and 弟 (younger brother). The reading こうてい follows the on'yomi of both characters.