hypermyoglobinemia UK /ˌhaɪpəˌmaɪəʊɡləʊbɪˈniːmɪə/US /ˌhaɪpɚˌmaɪoʊɡloʊbɪˈnimiə/ noun1 •Presence of excessive myoglobin in the blood, as occurs in rhabdomyolysis or various other conditions.