蛍 JLPT N1 Kanji 蛍 — lightning-bug, firefly JLPT N1 11 strokes Secondary (Jōyō) Radical 虫 #2031 most frequent Nature · Animal Readings On'yomiケイ Kun'yomiほたる Example words 蛍光灯けいこうとう(1) fluorescent lamp; fluorescent light (2) person who is slow to react; someone slow on the uptake