Lewis & Short

sēmĭ-pĕdālis, e, adj., a half-foot in size, half a foot long, broad, etc.: apertura, Vitr. 10, 19; Col. 11, 3, 21: spatium, id. 12, 52, 4: altitudo, Plin. 26, 8, 42, § 69: truncus, id. 13, 4, 8, § 37: pisciculus, id. 32, 1, 1, § 3; cf. the foll. art.