The Collaborative International Dictionary of English v.0.48:

Pallas \Pal"las\ (p[a^]l"las), prop. n. [L., fr. Gr. Palla`s,
   Palla`dos.] (Gr. Myth.)
   Pallas Athena, the Grecian goddess of wisdom, called also
   Athena, Pallas Athene or Athene, and identified, at a
   later period, with the Roman Minerva.
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

Pallas
    n 1: (Greek mythology) goddess of wisdom and useful arts and
         prudent warfare; guardian of Athens; identified with Roman
         Minerva [syn: Athena, Athene, Pallas, Pallas
         Athena, Pallas Athene]
    2: a large asteroid; the second asteroid to be discovered