The dragon defeated by Túrin in J.R.R. Tolkien’s The Silmarillion is Glaurung.
Glaurung is described as the first of the great dragons bred by Morgoth. He appears in the First Age and becomes a major enemy of the people of Hithlum, Nargothrond, and the House of Hador.
Túrin confronts Glaurung near the ravine of Cabed Naeramarth. Although Túrin kills the dragon with his sword Gurthang, Glaurung’s words and enchantment have already caused profound harm to Túrin and his family.
Glaurung is often confused with Smaug, the dragon from The Hobbit, or Ancalagon, the enormous winged dragon of the First Age. They belong to different episodes and generations of Tolkien’s mythology.