What is the boreas wind in Greece?

In the context of the climate of Greece, the boreas is an icy, cold wind that originates from the eastern regions of the Balkans.1

During winter, low-pressure disturbances moving into the Aegean region can draw this cold air from the heart of Eurasia, which is otherwise sheltered from western influences by the Dinaric mountain system. This wind is distinct from the mythological Boreas, who is the personification of the north wind in Greek mythology. The term boreas is also the etymological root for the bora, a powerful katabatic wind known for its high speeds and impact on coastal regions.1234