πενθημιμερής

A. consisting of five halves, i. e. of two and a half : in Prosody, τομὴ π. the caesura after two feet and a half, as in Hexam. and Iamb. Trim., Aristid. Quint. 1.25, etc.; τὸ π. (with or without μέτρον) the first two feet and a half of a verse, Quint. Inst. 9.4.78, Heph. 7.3, al., Sch.Ar. Av. 627.