Source : Webster's Revised Unabridged Dictionary (1913)

Boreas \Bo"re*as\, n. [L. boreas, Gr. ?.]
   The north wind; -- usually a personification.

Source : WordNet®

boreas
     n 1: a wind from the north [syn: {north wind}, {norther}]
     2: (Greek mythology) the god who personified the north wind;
        "Boreas was pictured as bearded and powerful and winged
        and draped against the cold"