from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The deep red, nonprotein, ferrous component of hemoglobin, C34H32FeN4O4.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The component of hemoglobin (and other hemoproteins) responsible for binding oxygen, consists of an iron ion that binds oxygen and a porphyrin ring that binds the globin molecules; one molecule binds one molecule of oxygen.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a complex red organic pigment containing iron and other atoms to which oxygen binds
Short for hematin.(American Heritage® Dictionary of the English Language, Fourth Edition)