ذأف 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.

• ذَأَفَ Form 1

  1 ذَأَفَ ذ , aor. ذَأََ , inf. n. ذَأَفَانٌ, [in the CK ذَأْفان,] He died: (Moheet, K, TA:) [or he died quickly: see ذَأْفٌ, which is app. an inf. n, as also, perhaps, ذُؤَافٌ.] -A2- ذَأْفَهُ, and ذَأَفَ عَلَيْهِ, inf. …

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• ذَأْفٌ

  ذَأْفٌ ذ Quickness of death; (Lth, T, M, K;) as also . (K.) [See 1, first sentence.] -b2- Also an inf. n. of ذَأَفَهُ. (M.)…

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