a trisyllabic foot, the arrangement of the syllables of which is long, short, long in quantitative meter, or stressed, unstressed, stressed in accentual meter, as anodyne, an accentual amphimacer.
am·phim·a·cer (ām-fĭm'ə-sər) n. A trisyllabic metrical foot having an unaccented or short syllable between two accented or long syllables, as in Peter Pan. Also called cretic.
[Latin amphimacrus, from Greek amphimakros : amphi-, amphi- + makros, long; see māk- in Indo-European roots.]