J. Curl (2001, 2002a)
ped·i·ment / ˈpedəmənt/ • n. the triangular upper part of the front of a building in classical style, typically surmounting a portico of columns. ∎ a similar feature surmounting a door, window, front, or other part of a building in another style. ∎ Geol. a broad, gently sloping expanse of rock debris extending outward from the foot of a mountain slope, esp. in a desert.DERIVATIVES: ped·i·men·tal / ˌpedəˈmentl/ adj.ped·i·ment·ed adj.
A. triangular gable-like part crowning a façade XVII;
B. base, foundation XVIII. Earlier pedament, pedement, refash. of periment (XVI), prob. deformation of PYRAMID. Sense B is due to direct assoc. with L. pēs, ped- -FOOT and -MENT, and the present form simulates derivation from these elements.