A distribution with zero kurtosis excess, i.e., 
.
Mesokurtic
See also
Kurtosis, Leptokurtic, PlatykurticExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Mesokurtic." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Mesokurtic.html