مضياق 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.

• مِضْيَاقٌ

  مِضْيَاقٌ ذ , (JK, and O on the authority of Ibn- 'Abbád, and TA,) or , like كِتَابٌ [in measure], thus in all the copies of the K, (TA,) [but probably, I think, taken from a mistranscription,] A pessary (دُرْجَةٌ) of ra…

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