erythrocytosis

noun
eryth·​ro·​cy·​to·​sis | \i-ˌrith-rə-ˌsī-ˈtō-səs \
plural erythrocytoses\ -​ˈtō-​ˌsēz \

Medical Definition of erythrocytosis 

: an increase in the number of circulating red blood cells especially resulting from a known stimulus (as hypoxia) — compare polycythemia

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