n.[C]

1. 【语】字尾
   The suffix -er is added to verbs to form nouns.

   字尾-er加到动词之后构成名词。

2. 【数】下标；添标

vt.

1. 【语】加……作字尾
2. 在物件的末尾附加

n.

1. a morpheme added at the end of a word to form a derivative (e.g. -ation).
2. Mathematics  another term for subscript.

v.