ἑφθημιμερής

English (LSJ)

ές,

   A containing seven halves, i.e. 3 1/2: esp. in metre, -μερές, τό, a measure of three feet and a half, such as the first 3 1/2 feet of a Hexameter or Iambic Trimeter, Heph.7.3, Sch.Ar.Pl.302 (pl.), etc.; ἑ. τομή a caesura after such a phrase, Aristid. Quint.1.25.