Quatorzain

A quatorzain is a poem of fourteen lines. Historically the term has been used interchangeably with the term "sonnet". Various writers have tried to draw distinctions between "true" sonnets and quatorzains. Nowadays the term is rarely used. When it is used, it is to distinguish fourteen-line poems that do not follow the various rules which describe the sonnet.
Some notable quatorzains were written by William Shakespeare and Elizabeth Barrett Browning. Another noteworthy quatorzain poet to mention is John Milton.