げんごろう 源五郎 LinksSentence search for 源五郎Sentence search for げんごろうSentence search for ゲンゴロウKanji details for 源, 五 and 郎Edit in JMdict Noun1. diving beetleUsually written using kana aloneNoun2. Japanese predacious diving beetle (Cybister japonicus)Other formsゲンゴロウ Discussions Log in to talk about this word.