Sesquipedalis, & hoc sesquipedâle, pen. prod. vt sesquipedalis crassitudo. Plin. A foote and an halfe thick.Dentes sesquipedales. Catull. Verba sesquipedalia. Horat. Ample and long wordes of many sillables: high wordes.
Lewis and Short: Latin dictionary
sesquĭ-pĕdālis, e, adj.I.Of a foot and a half; one foot and a half in length, breadth, or diameter, Cato, R. R. 15, 2: tigna, Caes. B. G. 4, 17: talea, Col. 5, 9, 3: mensura, id. 9, 15, 4; 11, 2, 18; 11, 3, 48; Vitr. 5, 10; 10, 15, 4.—II.Poet. transf., to denote excessive length, half a yard long: dentes, Cat. 97, 5: verba, Hor. A. P. 97; Mart. 7, 14, 10.