A poetic foot

• Metrical foot

Wikipedia Word definitions in Wikipedia
In Greek mythology, Paeon was the son of Antilochus , and a lord of Messenia . His father was one of the suitors of Helen , who together with his father Nestor , the king of Pylos , and brother Thrasymedes , fought in the Trojan War . Paeon's sons were ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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 ...

Wiktionary Word definitions in Wiktionary
n. (context poetry English) A foot containing any pattern of three short syllables and one long syllable.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
metrical foot of one long and three short syllables (in any order), c.1600, from Latin paeon , from Greek paion (see paean ). Related: Paeonic .