Lewis & Short

sēmĭ-pēs, pĕdis, m.

  1. I. A half-foot, half a foot.
      1. 1. As a measure of length, Cato, R. R. 123; Varr. R. R. 3, 5, 15: latum semipede, Vitr. 2, 3: minimi semipedum mensura, Plin. 9, 5, 4, § 11: non altiores quino semipede, id. 17, 11, 16, § 80: intervallo duum pedum et semipedis, id. 17, 20, 33, § 144.
      2. 2. A half-foot in verse, Varr. ap. Gell. 18, 15, 2; Aus. Ep. 4, 86; Aug. de Musica, 5, 11.
  2. II. Half-lame: crure trunco semipes, Prud. στεΦ. 2, 150.