Dictionary of Quadriliteral Verbs - Mu'jam al-Af'al al-Ruba'iyah

Arab verbs are made up to the vast majority of 3 letters, so are trilitary forms. However there is a quadrilateral form - Ruba'iyyah - more complex and rare. This dictionary lists them and explains their meaning, as well as the etymology and semantics that are often foreign in quadrilateral forms.

With the harakat in majority, the author classified the verbs by genre and systematically gives the sources of great works which he used to write this dictionary. There is an introduction to the rules related to Af'al Ruba'iya as well as indexes of searches for verbs in alphabetical order or by Masdar.