فيض 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.

• فَاضَ Form 1

  1 فَاضَ ذ , (S, M, Mgh, &c.,) aor. يَفِيضُ, inf. n. فَيْضٌ (S, M, O, Msb, K) and فَيْضُوضَةٌ (S, O, K) andفُيُوضٌ (M, O, K) and فِيُوضٌ and فُيُوضَةٌ (M, K) and فَيَضَانٌ, (M, O, K,) It (water) overflowed: poured out, or…

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• فَيْضٌ

  فَيْضٌ ذ A river, (M, TA,) in general: (TA:) pl. [of pauc.] أَفْيَاضٌ and [of mult.] فُيُوضٌ: the pluralization thereof shows that it is not an inf. n. used as a subst.: (M, TA:) [and a river, or water, that overflows.] …

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