こうのう 効能 Common word LinksSentence search for 効能Sentence search for こうのうSentence search for 功能Sentence search for くのうKanji details for 効 and 能Edit in JMdict Noun1. effect; effectiveness; efficacy; virtue; benefitOther forms功能 【こうのう】、功能 【くのう】Notesくのう: Out-dated or obsolete kana usage. Discussions Log in to talk about this word.