فض 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.

• فَضَّهُ Form 1

  1 فَضَّهُ ذ , (S, Mgh, O, Msb,) aor. يَفُضُّ, (S, O, Msb,) inf. n. فَضٌّ, (S, A, Mgh, O, Msb, K.) He broke it; namely, the seal (A, Mgh, Msb, K) of a letter; (A, K;) and any other thing; (TA:) he broke it asunder, or int…

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• فَضٌّ

  فَضٌّ ذ , (K,) or فَضٌّ مِنَ النَّاسِ, (O, TA,) A small number of men (نَفَرٌ) in a state of dispersion. (O, K, TA.) And تَمْرٌ فَضٌّ Dates in a separate state, not sticking together. (IAar. [See also فَثٌّ.]) And حَرِير…

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