Waki’ said Ba’l means the agricultural crop which grows by the rain water. Ibn Al Aswad said and Yahya, that is, Ibn Adam said I asked Abu Iyas al Asadi (about this word ba’l). He replied What is watered by rain.
وَكِيعٌ الْبَعْلُ الْكَبُوسُ الَّذِي يَنْبُتُ مِنْ مَاءِ السَّمَاءِ قَالَ ابْنُ الأَسْوَدِ وَقَالَ يَحْيَى يَعْنِي ابْنَ آدَمَ سَأَلْتُ أَبَا إِيَاسٍ الأَسَدِيَّ عَنِ الْبَعْلِ فَقَالَ الَّذِي يُسْقَى بِمَاءِ السَّمَاءِ وَقَالَ النَّضْرُ بْنُ شُمَيْلٍ الْبَعْلُ مَاءُ الْمَطَرِ