The Collaborative International Dictionary of English v.0.48:
Ogive \O"give\, n. [F. ogive, OF. augive a pointed arch, LL. augiva a double arch of two at right angles.] (Arch.) The arch or rib which crosses a Gothic vault diagonally. [1913 Webster]WordNet (r) 3.0 (2006):
ogive n 1: front consisting of the conical head of a missile or rocket that protects the payload from heat during its passage through the atmosphere [syn: nose cone, ogive]