A pyrrhic (/ˈpɪrɪk/; Greek: πυρρίχιος pyrrichios, from πυρρίχη pyrrichē) is a metrical foot used in formal poetry.
Although the pyrrhic by itself is not used in analysis of classical Greek prosody, examples exist of epigrammatic poems that employ nothing but short syllables (except at line ends where a syllable always scans long), creating a pyrrhic-like effect, such as an epigram addressed to the Cynic philosopher Diogenes and recorded in the Suda: Διόγενες, ἄγε, λέγε, τίς ἔλαβέ σε μόρος ἐς Ἄϊδος; ἔλαβέ με κυνὸς ὀδάξ.
[3] Edgar Allan Poe observed that many experts rejected it from English metrics and concurred:The pyrrhic is rightfully dismissed.
Its existence in either ancient or modern rhythm is purely chimerical, and the insisting on so perplexing a nonentity as a foot of two short syllables, affords, perhaps, the best evidence of the gross irrationality and subservience to authority which characterise our Prosody.
[4]By extension, this rhythmic pattern apparently formed the basis of an identically named ancient Greek war dance.