ھ ل لh-l-l
(ن، ض) هَلَّ يَهُلُّ وَيَهِلُّhalla yahullu wa-yahillu (original form: هَلَلَhalala): (of the new moon) to appear; (of a newborn child) to cry out. (This verb is not used in the Quran.)
هِلَالٌhilāl pl. اَهِلَّةٌahillah (noun, ism dhāt): the new moon of the first nights. Only once in the Quran: ﴿يَسْـَٔلُوْنَكَ عَنِ الْاَهِلَّةِ قُلْ هِيَ مَوَاقِيْتُ لِلنَّاسِ وَالْحَجِّ﴾ (Al-Baqarah 2:189)
Form IV (ifʿāl) اَهَلَّ يُهِلُّ اِهْلَالًاahalla yuhillu ihlālan: to call out (aloud) on seeing the new moon; then, to call out in general, and also to invoke someone's name (at the time of slaughter); اُهِلَّuhilla (passive voice): that over which (someone's) name has been invoked. ﴿وَمَآ اُهِلَّ بِهِۦ لِغَيْرِ اللّٰهِ﴾ (Al-Baqarah 2:173)