methaemoglobin

 
Pronunciation: /ˌmɛθiːməˈgləʊbɪn, mɛtˌhiː-/
(US methemoglobin)

noun

[mass noun] Biochemistry
  • a stable oxidized form of haemoglobin which is unable to release oxygen to the tissues, produced in some inherited abnormalities and by oxidizing drugs.