leavenerWiktionary 原文英美构词拆解leavenleaven词干er-er后缀-er(added to verbs) A person or thing that does an action indicated by the root verb; used to form an agent noun. · (added to verbs, informal) A person or thing to which the root verb is done or can be done satisfactorily.词源说明From leaven + -er.释义名词noun1Any agent that promotes leavening.