amphimacer
noun
am·phim·a·cer
amˈfiməsə(r),
ˈamfəˌmās-
plural -s
: a trisyllabic foot consisting of a short syllable between two long syllables in quantitative verse or of an unstressed syllable between two stressed syllables in accentual verse
the word runaway is an accentual amphimacer
called also cretic
Word History
Etymology
Latin amphimacrus, from Greek amphimakros, literally, long at both ends, from amphi- + makros long
First Known Use
1589, in the meaning defined above