Pronunciation: i'orn, i'ron
Definition: A metallic element, atomic no. 26, atomic wt. 55.847, which occurs in the heme of hemoglobin, myoglobin, transferrin, ferritin, and iron-containing porphyrins, and is an essential component of enzymes such as catalase, peroxidase, and the various cytochromes; its salts are used medicinally. For individual salts not listed here, see ferric and ferrous entries.
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Examples: glitazone, GI cocktail, etc.