leghemoglobin
noun
leg·he·mo·glo·bin
variants:
or chiefly British leghaemoglobin \ ˈleg-ˈhē-mə-ˌglō-bən 
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Medical Definition of leghemoglobin
: a plant hemoglobin found in the root nodules of legumes and reported to function as an oxygen-carrying pigment in symbiotic nitrogen fixation