Home › Words › H › hypercytokinemiahypercytokinemiahypercytokinemia means A potentially fatal immune reaction consisting of a positive feedback loop between cytokines and immune cells, with highly elevated levels of various cytokines.EtymologyFrom hyper- + cytokine + -emia.nounA potentially fatal immune reaction consisting of a positive feedback loop between cytokines and immune cells, with highly elevated levels of various cytokines.Definitions & examples from Wiktionary (CC BY-SA 3.0).