foundling

名词 foundling:

1. a child who has been abandoned and whose parents are unknown
   同义词：abandoned infant

1. He is a foundling, and has grown up in a school for homeless boy.
   他是个弃儿，在为无家可归的男孩而开设的学校里长大。

found.ling

n.（名词）
A deserted or abandoned child of unknown parentage.
弃婴，弃儿：一个不知父母为谁的弃婴

来源：
Middle English
中古英语
from found [past participle of] finden [to find] * see find
源自 found [] finden的过去分词 [寻找] *参见 find