Strophe

A strophe (/ˈstroʊfiː/) is a poetic term originally referring to the first part of the ode in Ancient Greek tragedy, followed by the antistrophe and epode. The term has been extended to also mean a structural division of a poem containing stanzas of varying line length. Strophic poetry is to be contrasted with poems composed line-by-line non-stanzaically, such as Greek epic poems or English blank verse, to which the term stichic applies.

In its original Greek setting, "strophe, antistrophe and epode were a kind of stanza framed only for the music," as John Milton wrote in the preface to Samson Agonistes, with the strophe chanted by a Greek chorus as it moved from right to left across the scene.

Strophe (from Greek , "turn, bend, twist") is a concept in versification which properly means a turn, as from one foot to another, or from one side of a chorus to the other.

In a more general sense, the strophe is a pair of stanzas of alternating form on which the structure of a given poem is based, with the strophe usually being identical with the stanza in modern poetry and its arrangement and recurrence of rhymes giving it its character. But the Greeks called a combination of verse-periods a system, giving the name "strophe" to such a system only when it was repeated once or more in unmodified form.

A simple form of Greek strophe is the Sapphic strophe. Like all Greek verse, it is composed of alternating long and short syllables (symbolized by — for long, u for short and x for either long or short) in this case arranged in the following manner:

...
Wikipedia