ogive /ˈoˌʤaɪv/
  交錯骨,尖頂拱
  O·give n.  Arch. The arch or rib which crosses a Gothic vault diagonally.
  ◄ ►
  ogive
       n : 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]