A manifold for which the Exterior Derivative of the Fundamental Form associated with the given Hermitian metric vanishes, so .
References
Amorós, J. Fundamental Groups of Compact Kähler Manifolds. Providence, RI: Amer. Math. Soc., 1996.
Iyanaga, S. and Kawada, Y. (Eds.). ``Kähler Manifolds.''
§232 in Encyclopedic Dictionary of Mathematics. Cambridge, MA: MIT Press, pp. 732-734, 1980.