عكوك 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.

• عَكَوَّكٌ

  عَكَوَّكٌ ذ , inadvertently said by J [and in the O] to be of the measure فَعَلَّعٌ, whereas it is of the measure فَعَوَّلٌ, like عَطَوَّدٌ, (IB, TA,) Fat and short, with toughness: (S, O:) or short, compact and strong, …

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