sep·te·nar·i·us 
(sĕp′tə-nârē-əs)
(sĕp′tə-nârē-əs)n. pl. sep·te·nar·i·i (-ē-ī′)
A Latin verse used only in comedy and consisting of seven feet, especially a catalectic iambic or trochaic tetrameter.
[Latin septēnārius, of seven, from septēnī, seven each, from septem, seven; see SEPTENNIAL.]