Am·phīm'a·cer, n.

noun

n. [Lat. amphimacrus, Gr. ἀμφίμακρος, long on both sides, from ἀμφί, on both sides, and μακρός, long.] (Anc. Pros.) A foot of three syllables, the middle one short and the others long, as in cāstĭtās. Andrews.