مض doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 2 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• مَضَّ Form 1

  1 مَضَّ ذ , (A,) or مَضِضَ, like فَرِحَ, (K) [but مَضِضَ, being contr. to rule, is probably a mistranscription, and its being said to be like فَرِحَ may be only to indicate the form of the sec. pers. &c.,] sec. pers. مَض…

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• مَضٌّ

  مَضٌّ ذ , applied to collyrium, (L, K,) and to the style, or bodkin, with which it is applied to the eyes, (S, O,) an inf. n. used as an epithet; (O;) Paining; (K;) or burning; (O, L;) or hot. (S.) You say, كَحَلَهُ كُحْ…

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