词根er背后的大文章

agent noun  https://en.wikipedia.org/wiki/Agent_noun

An agentive suffix is commonly used to form an agent noun from a verb. Examples:

buffer  1894, from buffer (n.). Related: Buffered; buffering.

　　1835, agent noun from obsolete verb buff "make a dull sound when struck" (mid-16c.), from Old French bufe "a blow, slap, punch" (see buffet (n.2)); hence also "something that absorbs a blow."

词根er背后的大文章

原文：http://www.cnblogs.com/liyongguo/p/6965337.html