Wikipedia has this to say about Ogives: 'In Gothic architecture, ogives are the intersecting transverse ribs of arches that establish the surface of a Gothic vault. An ogive or ogival arch is a pointed, "Gothic" arch, drawn with compasses as outlined above, or with arcs of an ellipse as described. A very narrow, steeply pointed ogive arch is sometimes called a "lancet arch.". Villard de Honnecourt, a 13th century itinerant master-builder of Picardy in the north of France, was the first writer to use the word ogive. The French term's origin is considered obscure by O.E.D.; it might come from the Late Latin obvita, the feminine past participle of obvire, to resist, i.e. the arches resisting the downward thrust of the structure's mass.'
In later Gothic styles, an ogival arch is a decorative arch delineating a void with a pointed head, formed of two ogee, or S-shaped curves.'
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