رضف 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.

• رَضَفَهُ Form 1

  1 رَضَفَهُ ذ , aor. رَضِفَ , (S, Msb, K,) inf. n. رَضْفٌ, (Msb,) He cauterized him, or it, (namely, a thing, Msb,) with a heated stone. (S, Msb, K.) -b2- And He roasted it (namely, flesh-meat,) upon heated stones. (Msb.)…

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• رَضْفٌ

  رَضْفٌ ذ Heated stones (S, O, Mgh, Msb, K) with which milk is made hot, or is made to boil; (S, O, K;) [and with which one cauterizes; and upon which flesh-meat is roasted; as shown above;] as also : (O, K:) n. un. with …

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