ملخص الدراسة:

The present research sheds light on four books of linguistics by Salah AL-Deen Khalil Bin Aibak AL-Safadi(764 A.H.) on the sihah (authentic) books of AL-Jawhari. Are these books a study of his evidence? Are they a summary of it? Are they interpretations of its ambiguities or a criticism of it? These books are:1. Hiljul Nawahi ala ma fi AL-Sihah min shawahid (evidence on AL-Sihah)2. Najdul falah fi mukhtasar AL-Sihah (summary of AL-Sihah)3. Ghawamidh AL-Sihah (ambiguities of AL-Sihah)4. Nufood AL-Sahim fi ma waqa a lljawhari min wahm (illusions of AL-Jawhari)The nature of the research demanded that it falls into a preface and two parts. The preface introduces the four books, and since the first and second book are not available, the research dealt with Ghawamidh AL-Sihah in the first part and Nufood AL-Sahim in the second part. The books were presented, introduced, studied and analysed. Finally, I hope that I was successful in this work.