A poetic foot

• Metrical foot

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

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 ...

Wikipedia Word definitions in Wikipedia
In Greek mythology , Paeon was a son of Poseidon by Helle , who fell into the Hellespont . In some legends he was called Edonus. He was the brother of the giant Almops .

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 .