Definition of Picardy third in US English:

Picardy third

noun

Music
  • Tierce de Picardie.

Origin

1940s. From Picardy, the name of a region and former province centred on Amiens in northern France + third, after French † tierce de Picardie.

Pronunciation

Picardy third

/ˌpɪkədi ˈθəːd/