تدرأ 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.

• تُدْرَأٍ

  السُّلْطَانُ ذُو تُدْرَأٍ ذ , (S, M, * K,) and , (K,) accord. to different relations of a trad. in which it occurs, (TA,) The Sultán is possessed of apparatus [of war], (عُدَّة, S, and so in some copies of the K,) or mig…

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