عَمَّ
in the phrase عَمَّ يَتَسَآءَلُونَ [Respecting what do they ask one another? in the Kur lxxviii. 1] is originally عَمَّا, [for عَنْ مَا,] the ا being elided in the interrogation [after the prep. عَنْ].
Lane's Lexicon — The most scholarly Arabic-English dictionary available
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