長男 は英語でfirstborn 英語の定義 長男 1. n. the eldest of all of a family's sons その他の翻訳と定義 firstborn firstborn 1. n. The first child to be born to a parent or family. 2. adj. Born as the first one in a family, flock or the like. 3. adj. Most excellent; most distinguished or exalted. ウィクショナリーから辞書引用辞書