Slavus (Medieval Latin) comes from Medieval Latin sclavus, from Ancient Greek Σκλάβος, from Ancient Greek Σκλαβηνός, from Proto-Slavic slověninъ, from Proto-Slavic slovo, from Proto-Balto-Slavic ślawas, from Proto-Indo-European ḱléwos, from Proto-Indo-European ḱlew- — to cover; to incline.