مطنب doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 5 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• مَطْنَبٌ

  مَطْنَبٌ ذ The shoulder, syn. مَنْكِب; and the part between the shoulder-joint and the neck, syn. عَاتِق: (S, O, K:) and accord. to a marginal note in a copy of the L, signifies the same: (TA:) pl. مَطَانِبُ. (S, O.) -b2…

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• مُطْنِبٌ

  مُطْنِبٌ ذ [part. n. of 4, q. v. As such signifying] (assumed tropical:) A great praiser of every one. (TA.) -b2- And نَهْرٌ مُطْنِبٌ (tropical:) A river that goes [or flows] far away. (A, O.) [See also مُطَنِّبٌ.]…

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• مِطْنَبٌ

  مِطْنَبٌ ذ : see مَطْنَبٌ.…

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• مُطَنَّبٌ

  مُطَنَّبٌ ذ A tent, (بَيْت, O, or خِبَآء, S,) and a رِوَاق, (S,) tied, or made fast, with أَطْنَاب [or tentropes]. (S, O.) A man is related to have said to Ubeí Ibn-Kaab, in reply to the latter's advising him to buy a b…

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• مُطَنِّبٌ

  عَسْكَرٌ مُطَنِّبٌ ذ [perhaps correctly مُطْنِبٌ, q. v.,] (assumed tropical:) An army of which the remotest part is not seen, by reason of its multitude. (TA. [See also what next follows.])…

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