first-born

名词 first-born:

1. the offspring who came first in the order of birth
   同义词：firstborn, eldest

形容词 first-born:

1. first in order of birth
   同义词：firstborn, eldest

first-born

adj.（形容词）
First in order of birth; born first.
头生的，最长的：出生顺序在先的；先生的
n.（名词）
The child in a family who is born first.
长子，长女：一家中最先出生的孩子