hemoglobin (US) noun
or British haemoglobin /ˈhiːməˌgloʊbən/ or British haemoglobin /ˈhiːməˌgloʊbən/ Learner's definition of HEMOGLOBIN
[noncount] technical
: the part of blood that contains iron, carries oxygen through the body, and gives blood its red color血红素