OGIVAL

World English Dictionary
ogive (ˈəʊdʒaɪv, əʊˈdʒaɪv)
 
n
1.  a diagonal rib or groin of a Gothic vault
2.  another name for lancet arch
3.  statistics a graph the ordinates of which represent cumulative frequencies of the values indicated by the corresponding abscissas
4.  the conical head of a missile or rocket that protects the payload during its passage through the atmosphere
 
[C17: from Old French, of uncertain origin]
 
o'gival
 
adj

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