Definition of pythiambic in US English:

pythiambic

noun

Classical Prosody
  • A composite metre consisting of a dactylic hexameter (Pythian metre) followed by an iambic colon.

adjective

Classical Prosody
  • Of or relating to this metre.

Origin

Mid 19th century. From post-classical Latin pythiambicus, adjective from classical Latin Pȳthius Pythian + iambicus.