ferritin

[fer-i-tn]
noun Biochemistry.
an amber-colored, crystalline protein, found in the liver, spleen, and bone marrow, that consists of apoferritin combined with a ferric hydroxide-ferric phosphate complex and that stores iron for use in metabolism.

Origin:
1935–40; ferrite + -in2

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World English Dictionary
ferritin (ˈfɛrɪtɪn)
 
n
biochem a protein that contains iron and plays a part in the storage of iron in the body. It occurs in the liver and spleen
 
[C20: from ferrite + -in]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

ferritin fer·ri·tin (fěr'ĭ-tĭn)
n.
An iron-containing protein complex, found principally in the intestinal mucosa, spleen, and liver, that functions as the primary form of iron storage in the body.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
If you haven't already, get a serum ferritin test to check if the iron you are taking orally is being absorbed.
Ferritin is a protein that binds to iron and helps to store iron in the body.
Ferritin is a protein that binds to iron, and low levels typically mean the patient does not have enough iron in their body.
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