ضيون 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.

• ضَيْوَنٌ

  ضَيْوَنٌ ذ , (S, M, K,) of the measure فَيْعَلٌ, not فَعْوَلٌ, because the former is the more common, (IB, TA,) extr. [in respect of rule], preserving its original form, (M,) without إِدْغَام [i. e. not having its و inco…

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