The definition of hemoglobin is the red iron pigment that makes red blood cells red.
An example of hemoglobin is what brings oxygen from the lungs to the body's tissue.
- the red coloring matter of the red blood corpuscles of vertebrates, a protein yielding heme and globin on hydrolysis: it carries oxygen from the lungs to the tissues, and carbon dioxide from the tissues to the lungs
- any of various respiratory pigments found in the blood or muscle tissue of many invertebrates and in the root nodules of some plants
Origin of hemoglobincontr. (as if from hemo-) from earlier haematoglobulin: see hemato- and globulin
The protein in the red blood cells of vertebrates that carries oxygen from the lungs to tissues and that consists of four polypeptide subunits, each of which is bound to an iron-containing heme molecule.
Origin of hemoglobinUltimately short for hematinoglobulin hematin globulin
From Ancient Greek αἷμα (haima, “blood”) + Latin globus (“ball, sphere”) + -in.