فطنه doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• فطّنهُ Form 2

  2 فطّنهُ للأَمْرِ ذ , (Msb, TA,) inf. n. تَفْطِينٌ, (K, TA,) He made him to understand, or know, the affair: (K, * TA:) or he made him knowing in the various modes of the affair, and skilful therein. (Msb.) Hence the pro…

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