Literally mother of ghouls, that is the abode of ghouls.

• IPA^(key): /ʔumm ɣiː.laːn/, /ʔumm ɣaj.laːn/

أُمّ غِيلَان or أُمّ غَيْلَان • (ʔumm ḡīlān or ʔumm ḡaylān) f

1. Used other than figuratively or idiomatically: see أُمّ (ʔumm),‎ غَيْلَان (ḡaylān).
   • a. 700, Ḍirār ibn al-Ḵaṭṭāb al-Fihrīy, جَزى اللَهُ عَنّا أُمَّ غيلانَ صالِحاً‎^[1]:
2. gum arabic tree, Vachellia nilotica; gum-bearing acacia (Vachellia gummifera, which is spread in Morocco, delimiting the distribution of Vachellia nilotica more eastwards)
   • a. 1283, Abū Yahyā Zakariyāʾ ibn Muhammad al-Qazwīnīy, edited by Ferdinand Wüstenfeld, عجائب المخلوقات وغرائب الموجودات [ʿajāʾib al-maḵlūqāt wa-ḡarāʾib al-mawjūdāt]‎^[2], Göttingen: Verlag der Dieterichschen Buchhandlung, published 1849, →DOI, page 249:

     أم غيلان شجرة عضاه البادية كثيرة الشوك قال الشيخ الرئيس أصوله يسمّى بنك يخربه به يطيب رائحة البدن ويقطع رائحة النورة.

     The gum-arabic tree is a spiky shrub of the desert, of many thorns, Šayḵ ar-Raʾīs says its stems are called bang, they are transfixed and improve the smell of the Nubian ibex and it cuts the smell of the flower.

• → Classical Persian: امغیلان (ammuġīlān, ammuġaylān), oftener مغیلان (moġilân, moġaylân)
  • → Old Anatolian Turkish: مغیلان
    • Classical Azerbaijani: müğilan
    • Ottoman Turkish: مغیلان (mugaylan)

• Corriente, Federico, Pereira, Christophe, Vicente, Angeles, editors (2017), Dictionnaire du faisceau dialectal arabe andalou. Perspectives phraséologiques et étymologiques (in French), Berlin: De Gruyter, →ISBN, page 73
• Corriente, Federico, Pereira, Christophe, Vicente, Angeles, editors (2017), Dictionnaire du faisceau dialectal arabe andalou. Perspectives phraséologiques et étymologiques (in French), Berlin: De Gruyter, →ISBN, page 938
• Zenker, Julius Theodor (1876) “مغیلان”, in Türkisch-arabisch-persisches Handwörterbuch, volume 2 (overall work in German and French), Leipzig: Wilhelm Engelmann, page 867a