noun
a red protein responsible for transporting oxygen in the blood of vertebrates
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Hemoglobin is a protein molecule in red blood cells that carries oxygen from the lungs to the body's tissues.
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My doctor said my hemoglobin levels are low and I need to eat more iron-rich foods.
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I heard that guy is always tired because he has weak hemoglobin.
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The hemoglobin of the team is their star player who always delivers in clutch moments.