hephthēmĭmĕres, is, f., = ἑφθημιμερής (sc. τομή), in hexameter or Iambic verse,
the caesura which occurs after the first half of the fourth foot , Lat. semiseptenaria (insectio), Diom. 497, 9 and 23; Serv. de Cent. Metr. 1817 P.