|sīəˌnō+ noun
or cy·an·methemoglobin |sīˌan, -īən+
( -s )
Etymology: International Scientific Vocabulary cyan- + methemoglobin; originally formed as German zyanmethämoglobin
: a bright red crystalline compound formed by the action of hydrogen cyanide on methemoglobin in the cold or on oxyhemoglobin at body temperature