hypermagnesemia

noun
hy·​per·​mag·​ne·​se·​mia
variants: or chiefly British hypermagnesaemia \ -​ˌmag-​ni-​ˈsē-​mē-​ə How to pronounce hypermagnesaemia (audio) \

Medical Definition of hypermagnesemia

: the presence of excess magnesium in the blood serum