Pre-Greek: The lost language hidden within Ancient Greek

Around 1,000 Greek words can't be traced to any Indo-European language. Where do they come from?

Ἦσαν οἱ Πελασγοὶ βάρβαρον γλῶσσαν ἱέντες.
'The Pelasgians spoke a language which was not Greek.' — Herodotus (Histories 1.57)

These lexical enigmas include words often thought quintessentially Greek: λαβύρινθος (labýrinthos) 'labyrinth', ἐλαία (elaía) 'olive', Ἀχιλλεύς, Ὀδυσσεύς, Κόρινθος, Ἀθῆναι / Ἀθήνη, Ἄρης.

Despite centuries of effort, linguists have not traced them to Proto-Indo-European (PIE) nor securely to neighboring known languages. This essay digs through linguistic history for the mystery language—Pre-Greek—that influenced Ancient Greek.

Paleo-European / Old European languages

Indo-European speakers were pastoralist newcomers to lands occupied by Neolithic Early European Farmers speaking Paleo-European languages. Few left writing (Aquitanian, Etruscan, Iberian…); only Basque survives. Yet they left marks on successor Indo-European languages.