1. （两者中）年龄较大的，年长的
The elder of two people is the one who was born first.
elder在线翻译
e.g. ...his elder brother.
他哥哥
e.g. ...the elder of her two daughters.
她两个女儿中年长的那个
2. （尤指年纪大很多的）年长者，长辈
A person's elder is someone who is older than them, especially someone quite a lot older.
e.g. The young have no respect for their elders.
年轻人不尊重他们的长辈。
3. 有威望的长者;元老
In some societies, an elder is one of the respected older people who have influence and authority.
e.g. ...tribal elders.
部落长老
4. （某些基督教会中不担任牧师的）长老
In some Christian churches, an elder is one of the people who hold a position of responsibility, but not usually a minister.
e.g. He is now an elder of the village church.
他现在是乡村教会的长老。
5. 接骨木
An elder is a bush or small tree which has groups of small white flowers and black berries.