JMdict: 1794800

蛍雪 【けいせつ】

  1. [n] diligence in studying (e.g. continuing to study even in such poor light as offered by a firefly or that reflected by snow); diligent study
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
Lightning-bug, Firefly ケイ ほたる
Snow セツ ゆき 2