ひらくさ 平草 LinksSentence search for 平草Sentence search for ひらくさSentence search for ヒラクサKanji details for 平 and 草Edit in JMdict Noun1. Ptilophora subcostata (species of red alga)Usually written using kana alonePlace2. HirakusaOther formsヒラクサ Discussions Log in to talk about this word.