Though the Italian as well as the French both mean pink, the name is a false cognate derived from the Franco-Provençal Valdôtain patois word rouése, meaning glacier. On old maps as late as 1740, the mountain was named Monte Bosa and even Monte Biosa by the inhabitants of Val Sesia. The name Mon Boso which appears in Leonardo da Vinci's notebooks very likely designated the same mountain. From Zermatt the mountain was formerly known under the name Gornerhorn (in Walliser German, lit. Large/Strong Horn). The name gorner is still used for the western ridge that is thrown out from the main mass (Gornergrat) and the glacier that lies at its foot (Gornergletscher) but not used for the mountain itself anymore. Nowadays, in German, the Italian Monte Rosa is used instead (Monte Rosa-Gletscher, Monte Rosa-Hütte, etc.).