Definition of 第一子 (だいいっし)
だいいっし
                        第一子
だいいっし
daiisshi
noun
•
        
firstborn, first child, eldest child
Related Kanji
| 第 | No., residence | 
| 一 | one, one radical (no.1) | 
| 子 | child, sign of the rat, 11PM-1AM, first sign of Chinese zodiac |