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proton pump inhibitor
proton synchrotron
protonema
protonics
protonotary
protoplanet
protoplasm
protoplast
protoporphyrin
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protoporphyrin
pro·to·por·phy·rin [ prtō páwrfərin ]


noun 
Definition:
 
building block of hemoglobin: a purple porphyrin acid that combines with iron to form the deep red of iron-containing proteins such as hemoglobin and cytochrome
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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