Hendecasyllabics are lines or verse written in hendecasyllabic meter, meaning each line has eleven syllables. In classical poetry, the term usually points to the Catullan hendecasyllable: a fixed Latin line with a distinctive pattern of heavy and light syllables rather than a simple count alone.
Because the word is sometimes used loosely, it may refer either to any eleven-syllable verse or, more specifically, to the classical Latin meter used by Catullus.
Example
Soft summer wind moves through the olive trees,
While doves call once, and dusk settles over stone.