Etymology tree Proto-Indo-European *h₂weh₁-der. Proto-Indo-European *-tḗr Proto-Indo-European *-tromder. Ancient Greek ἆθλον (âthlon) Ancient Greek ᾱ̓θλέω (āthléō) Proto-Hellenic *-tās Ancient Greek -τής (-tḗs) Ancient Greek ἀθλητής (athlētḗs) Proto-Indo-European *-kos Ancient Greek -κός (-kós) Ancient Greek -ικός (-ikós) Ancient Greek ᾱ̓θλητῐκός (āthlētĭkós)bor. Latin āthlēticuslbor. Middle…