JMdict: 1447310

投函 【とうかん】

  1. [n,vs,vt] mailing; posting
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
投 Throw, Discard, Abandon, Launch Into, Join, Invest In, Hurl, Give Up, Sell At A Loss トウ な.げる, -な.げ
函 Box (archaic) カン はこ, い.れる