Hugo Wilhelm Traugott Erdmann (8 May 1862 – 25 June 1910) was the German chemist who discovered, together with his doctoral advisor Jacob Volhard, the Volhard-Erdmann cyclization. In 1898 he was the first who coined the term noble gas (the original noun is Edelgas in German).Erdmann invented the name Thiozone in 1908, hypothesizing that S3 made up a large proportion of liquid sulfur.