"Sound in isnad." A technical attribute applied to the "isnad" of a hadith
with reference to ahadith, sound, authentic.
a "sound" or reliable hadith
sound. A hadîth with an unbroken chain of narrators, ranging from the Prophet Muhammad (saw) and approaching an era through reliable reporters without being shâdh (odd) or mu‘allal (faulty) in between the two cross relaters.
rigorously authenticated hadith in its text [matn] and transmission [isnad].
literally: authentic, correct, accurate; it is generally used to refer to a collection, group of collections, or book of verified and authenticated ahadith (plural of hadith, tradition; see muhaddith above) of the Holy Prophet
Sahih is a Islamic term that means authentic. It is commonly used to describe the authenticity of a Hadith.