or  cy*an*met*he*mo*glo*bin  or chiefly Brit  cy*a*no*met*hae*mo*glo*bin  or  cy*an*met*hae*mo*glo*bin  n :  a bright red crystalline compound formed by the action of hydrogen cyanide on methemoglobin in the cold or on oxyhemoglobin at body temperature .
 
 
 
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