The Collaborative International Dictionary of English v.0.48:
Mesostate \Mes"o*state\, n. [Meso- + Gr. ? to make to stand.] (Physiol.) A product of metabolic action. [1913 Webster] Note: Every mesostate is either an anastate or katastate, according as it is formed by an anabolic or katabolic process. See Metabolism. [1913 Webster]