ちょうし 長子 LinksSentence search for 長子Sentence search for ちょうしSentence search for えこKanji details for 長 and 子Edit in JMdict Noun1. eldest child; oldest child; first childOnly applies to ちょうし, See also 末子 ばっしNoun2. eldest son; oldest sonOther forms長子 【えこ】Notesえこ: Out-dated or obsolete kana usage. Discussions Log in to talk about this word.