Heptameter

Heptameter is one or more lines of verse containing seven metrical feet (usually fourteen or twenty-one syllables).

An example from Lord Byron's "Youth and Age":

:'Tis but as ivy-leaves around the ruin'd turret wreathe,:All green and wildly fresh without, but worn and gray beneath.

:O could I feel as I have felt, or be what I have been,:Or weep as I could once have wept o'er many a vanish'd scene,-:As springs in deserts found seem sweet, all brackish though they be,:So midst the wither'd waste of life, those tears would flow to me!

ee also

* Fourteener (poetry)
* Archilochian
* Iambic heptameter