tribrachic

/traɪˈbrækɪk/
adjective
  1. Relating to or consisting of a tribrach (a metrical foot of three short syllables).
    • The line has a tribrachic pattern that makes it feel hurried.
    • She analyzed the tribrachic structure of the ancient Greek verse.
    • Tribrachic feet are rare in English poetry because of the language's stress patterns.