Ogive
OGIVE (a French term, of which the origin is obscure; auge, trough, from Lat. augcre, to increase, and an Arabic astrological word for the " highest point," have been suggested as derivations), a term applied in architecture to the diagonal ribs of a vault. In France the name is generally given to the pointed arch, which has resulted in its acceptance as a title for Gothic architecture, there often called " le stvle ogival."
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)