ذاهن 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.

• ذَاْهَنَ Form 3

  3 ذَاْهَنَ ذَاهَنَنِى He vied with me, or contended with me for superiority, in intelligence, understanding, sagacity, acuteness, skill, or knowledge, and I surpassed him [therein, i. e.,] in ذِهْن. (K.)…

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