The Kitāb al-gÿāmi‘ li ṣifāt aštāt al-nabāt wa-ḍurūb anwā‘ al-mufradāt (Compendium of the properties of diverse plants and various kinds of simple drugs) by Abū ‘Abd Allāh Muḥammad Ibn Muḥammad Ibn ‘Abd Allāh Ibn Idrīs al-‘Alī bi-Amr Allāh, best known as al-Idrīsī (d. between 1165 and 1176), is a botanical work in which he lists in alphabetical order the names of plants and simple drugs by giving their translations in several languages such as Hebrew, Syriac, Latin, Greek, Romance, hindī, turkī, nabaṭī and above all Sicilian Arabic and Andalusi Arabic. The analysis of the Sicilian Arabic terms in the Kitāb might be fruitful for the reconstruction of Sicilian Arabic features that are yet to be defined. Moreover, the Andalusi Arabic vocabulary contained in the Kitāb might help to shed new light on the characteristics of Spanish Arabic and Maghribi Medieval dialects lexicon.