Word: 函 (hán) 函 dictionary entry hán envelope; case; letter Full dictionary entry for 函 Example sentences using 函 2 sentences, showing page 1 of 1. 这封函写得很客气。 Zhè fēng hán xiě de hěn kèqi. This letter is written very politely. 这封函是谁写的？ Zhè fēng hán shì shéi xiě de? Who wrote this letter?