amphibrach

noun2

1. •
   A metrical foot in ancient Greek or Latin consisting of two short syllables surrounding one long one (e.g. amāta).
2. •
   A metrical foot in modern prosody, consisting of three syllables, the middle one of which is stressed (e.g. Jamaica).

   • Then Banoffsky launched into Glinka's great amphibrachs [...]: Subside, agitation of passion! — 1969