myoglobinemia UK /ˌmaɪəʊɡləʊbɪˈniːmɪə/US /ˌmaɪoʊɡloʊbɪˈnimiə/ noun1 •Presence of myoglobin in the blood or (usually, more specifically) excessive myoglobin in the blood, as occurs in rhabdomyolysis or various other conditions.