تزندق 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.

• تَزَنْدَقَ Form Q. 2

  Q. 2 تَزَنْدَقَ ذ [He adopted, or held, or professed, the tenets of the زِنْدِيق;] he was, or became, a زِنْدِيق: (S, * K, * TA:) [generally,] he was, or became, a مُلْحِد [i. e. deviater from the right religion, or an i…

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