(التَّخَلُّف) (فِي علم النَّفس) بطء فِي النمو الْعقلِيّ للطفل حِين يقل الذكاء عَن حد السوَاء دون أَن يُوصف الطِّفْل بِأَنَّهُ ضَعِيف (مج)
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A Quranic text search tool and word frequency finder for researchers. Instant auto-updating results. Normalized/abjad string matches with partial within-word lookups. Highlighting. Citations. 
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