Derived from the active participle of طَهَر (ṭahar, “to become pure”), from the root ط ه ر (ṭ h r). Compare Hebrew טהור (ṭahor, “pure”) and Ugaritic 𐎉𐎅𐎗 (ṭhr, “pure”).
Practice speaking and memorizing "طاهر" and many other words and sentences in Arabic.