Definition of Hemoglobin

1. Noun. 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"

Exact synonyms: Haemoglobin, Hb
Substance meronyms: Erythrocyte, Rbc, Red Blood Cell
Generic synonyms: Haemoprotein, Hemoprotein
Specialized synonyms: Oxyhaemoglobin, Oxyhemoglobin
Terms within: Haem, Haemitin, Hematin, Heme, Protoheme, Globin, Haematohiston, Hematohiston

Definition of Hemoglobin

1. n. The normal coloring matter of the red blood corpuscles of vertebrate animals. It is composed of hematin and globulin, and is also called hæmatoglobulin. In arterial blood, it is always combined with oxygen, and is then called oxyhemoglobin. It crystallizes under different forms from different animals, and when crystallized, is called hæmatocrystallin. See Blood crystal, under Blood.

Definition of Hemoglobin

1. Noun. The iron-containing substance in red blood cells that transports oxygen from the lungs to the rest of the body; it consists of a protein (''globulin''), and ''haem'' (a porphyrin ring with an atom of iron at its centre). ¹

¹ Source:

Definition of Hemoglobin

1. [n -S]

Medical Definition of Hemoglobin

1. Four subunit globular oxygen carrying protein of the erythrocytes of vertebrates and some invertebrates. It is a conjugated protein containing four haem groups and globin. There are two alpha and two beta chains (very similar to myoglobin) in adult humans, the haem moiety (an iron containing substituted porphyrin) is firmly held in a nonpolar crevice in each peptide chain. There are four globin polypeptide chains, designated alpha, beta, gamma, delta in the adult. Each is composed of several hundred amino acids. (08 Mar 2000)

Hemoglobin Pictures

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Lexicographical Neighbors of Hemoglobin

hemoglobin (current term)

Literary usage of Hemoglobin

Below you will find example usage of this term as found in modern and/or classical literature:

1. A Text-book of physiology: For Medical Students and Physicians by William Henry Howell (1915)
"In man and in most of the mammalia hemoglobin is deposited in the form of rhombic prisms; in the guinea-pig it crystallizes in tetrahedra (d, Fig. ..."

2. Physiological chemistry: A Text-book and Manual for Students by Albert Prescott Mathews (1916)
"hemoglobin. This, the red coloring matter of the blood, is confined in the vertebrate blood to the red blood corpuscles. If small quantities are present in ..."

3. Text-book of Human Physiology: Including Histology and Microscopical Anatomy by Leonard Landois, Albert Philson Brubaker (1905)
"CARBON-MONOXID hemoglobin AND CARBON-MONOXID POISONING. Carbon-monoxid hemoglobin is a more stable combination than the preceding and is produced when ..."

4. A Lifelong Passion: Nicholas and Alexandra: Their Own Story by Andrei Maylunas (2005)
"A high maternal hemoglobin level during pregnancy has been correlated to a low birth weight and a low placental weight, but has not been investigated in ..."

5. Diagnostic Methods, Chemical, Bacteriological and Microscopical: A Text-book by Ralph Waldo Webster (1920)
"Met- hemoglobin, in alkaline solution shows two absorption bands, ... This pigment is a molecular combination of one molecule of hemoglobin with one ..."

6. The Journal of Experimental Medicine by Rockefeller University, Rockefeller Institute, Rockefeller Institute for Medical Research (1919)
"The hemoglobin per cent remained stationary until the volume had been restored; the total hemoglobin, however, during this time showed a marked increase ..."

7. Principles of Biochemistry for Students of Medicine, Agriculture and Related by Thorburn Brailsford Robertson (1920)
"THE CHEMISTRY OF hemoglobin. The red coloring-matter in the erythrocytes of the vertebrates is hemoglobin, a compound protein which is split by ..."

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