د ل لd-l-l
(ن) دَلَلَ يَدْلُلُdalala yadlulu (original) ⟵ دَلَّ يَدُلُّ دَلَالَةًdalla yadullu dalālatan: to guide, to show the way. ﴿هَلْ اَدُلُّكُمْ عَلٰى تِجَارَةٍ﴾ (Aṣ-Ṣaff 61:10); ﴿مَا دَلَّهُمْ عَلٰى مَوْتِهِۦٓ اِلَّا دَآبَّةُ الْاَرْضِ﴾ (Sabaʾ 34:14)
دَلِيْلٌdalīl (an adjective on the pattern of فَعِيْلٌfaʿīl): one who guides; also a proof, an argument. ﴿ثُمَّ جَعَلْنَا الشَّمْسَ عَلَيْهِ دَلِيْلًا﴾ (Al-Furqān 25:45)
Form X (istifʿāl) اِسْتَدَلَّ يَسْتَدِلُّ اِسْتِدْلَالًاistadalla yastadillu istidlālan: to adduce proof for something; to infer by reasoning (this verb is not used in the Quran).