ogee (n.)

in architecture, "an S-shaped molding," 1670s, said to be from a corruption of French ogive "diagonal rib of a vault" of a type normal in 13c. French architecture, earlier augive, a word of unknown origin. According to Watkins, in part from Latin via "way, road" (see via). Related: ogival. Middle English had ogif (late 13c.) "a stone for the diagonal rib of a vault," from the French word and Medieval Latin ogiva.