がいえん 外炎 LinksSentence search for 外炎Sentence search for がいえんSentence search for 外焔Kanji details for 外 and 炎Edit in JMdict Noun1. outer cone (of a flame); oxidizing flameChemistry, See also 内炎Other forms外焔 【がいえん】Notes外焔: Rarely-used kanji form. Discussions Log in to talk about this word.