おにくさ 鬼草 LinksSentence search for 鬼草Sentence search for おにくさSentence search for オニクサKanji details for 鬼 and 草Edit in JMdict Noun1. Gelidium japonicum (species of seaweed)Usually written using kana aloneOther formsオニクサ Discussions Log in to talk about this word.