副ふく反はん応のうTop 15000MeaningsNoun1. side effect (of a vaccine)2. side reactionKanji used副secondary反be against応respond with actionComposed of副ふくassistant; associate; vice-; sub-; deputy; substitute; auxiliary; supplementary; additional; collateral; …Noun反はん応のうreaction; response; physical reaction (to a stimulus); observable response (of an organism); effect; changeNoun