プログレッシブ和英中辞典(第３版)の解説
おとうと【弟】
one's (younger) brother (▼英米では特に区別するとき以外はyoungerをつけない); 〔義弟〕one's brother-in-law ((複brothers-in-law)); 〔異父母弟〕one's half-brother
- 末の弟
one's youngest brother
弟弟子｜a younger pupil [disciple] (of the same teacher); a younger fellow pupil [disciple]
弟分｜a sworn brother