Meaning of -ER in English

-ER

suffix 1 forming nouns and adjectives through OF or AF, corresponding to: a L -aris (sampler) (cf. -AR(1)). b L -arius, -arium (butler; carpenter; danger). c (through OF -eâre) L -atura or (through OF -eær) L -atorium (see COUNTER(1), FRITTER(2)). 2 = -OR.

English main colloquial, spoken dictionary.      Английский основной разговорный словарь.