glycohemoglobin
noun
gly·co·he·mo·glo·bin ˌglī-kō-ˈhē-mə-ˌglō-bən 
: hemoglobin a1c
Glycohemoglobin is a substance produced when sugar molecules in the blood attach themselves to hemoglobin molecules, which carry oxygen through the bloodstream. 
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Word History
First Known Use
1978, in the meaning defined above
Medical Definition
glycohemoglobin
noun
gly·co·he·mo·glo·bin -ˈhē-mə-ˌglō-bən
: hemoglobin a1c