ケシ LinksSentence search for ケシSentence search for 芥子Sentence search for けしSentence search for 罌粟Edit in JMdict Noun1. opium poppy (Papaver somniferum)Usually written using kana aloneOther forms芥子 【けし】、罌粟 【けし】Notes罌粟: Rarely-used kanji form. Discussions Log in to talk about this word.