On Thursday, the 26th of November 2015 at 9:00 a.m. at the Seminar Hall of the Faculty of Humanities the Masters Thesis Defense of Ms. Ghayda Adel Abdulqader, a postgraduate student from the Department of Arabic Language at the University of Zakho, on Linguistic Bases of Defective Roots and Their Derivatives in the Book of Maqaees Allugha Lexicolographical Study took place.