['pi:әn]
[诗](由一个长[重读]音节与三个短[非重读]音节构成的)四音节的韵脚

paeon \p[ae]"on\ (p[=e]"[o^]n), n. [L. paeon, Gr. paiw`n a
solemn song, also, a p[ae]on, equiv. to paia`n. See
{P[ae]an}.] (Anc. Poet.)
A foot of four syllables, one long and three short, admitting
of four combinations, according to the place of the long
syllable. [Written also, less correctly, {p[ae]an}.]