noun

• (countable, religion, Islam) An eyewitness account of a saying or action of Muhammad or sometimes one of his companions not otherwise found in the Quran.
• (countable, in the plural, religion, Islam) A particular accepted collection of such accounts, as from a single source or within a particular branch of Islam or Islamic jurisprudence.
• (uncountable, religion, Islam) The entire collection of hadiths (sayings and deeds) of Muhammad within a particular branch of Islam or Islamic jurisprudence.