kurtosis

noun

kur·​to·​sis (ˌ)kər-ˈtō-səs 

: the peakedness or flatness of the graph of a frequency distribution especially with respect to the concentration of values near the mean as compared with the normal distribution

Word History

Etymology

Greek kyrtōsis convexity, from kyrtos convex — more at curve

First Known Use

1905, in the meaning defined above