Noun hb has 1 sense
  1. hemoglobin, haemoglobin, Hb - a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues; "fish have simpler hemoglobin than mammals"
    --1 is a kind of hemoprotein, haemoprotein
    --1 is a substance of red blood cell, RBC, erythrocyte
    --1 has substances:
     heme, haem, hematin, haemitin, protoheme; globin, hematohiston, haematohiston
    --1 has particulars: oxyhemoglobin, oxyhaemoglobin
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