The story
From erythrocyte + -emia, with /θ/ for euphony; akin to erythro- + -cyte + -emia and erythro- + -cyte + hem- + -ia; morphologically parallel with polycythemia.
Etymology from Wiktionary, CC BY-SA 4.0.
erythrocythemia
Today it means: Synonym of polycythemia. Full definition →