noun Biochemistry.
any of several carrier molecules in the mitochondria of plant and animal cells, consisting of a protein and an iron-containing porphyrin ring and participating in the stepwise transfer of electrons in oxidation reactions: each cytochrome alternately accepts and releases an electron at a slightly lower energy level in the order designated b, c 1 , c, a, and a 3 .

1895–1900; cyto- + -chrome Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cytochrome (ˈsaɪtəʊˌkrəʊm)
any of a group of naturally occurring compounds, consisting of iron, a protein, and a porphyrin, that are important in cell oxidation-reduction reactions

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

cytochrome cy·to·chrome (sī'tə-krōm')
Any of a class of iron-containing proteins important in cell respiration as catalysts of oxidation-reduction reactions.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
cytochrome   (sī'tə-krōm')  Pronunciation Key 
Any of a class of usually colored proteins that play important roles in oxidative processes and energy transfer during cell metabolism and cellular respiration. Cytochromes are electron carriers. They contain a heme group and are similar in structure to hemoglobin and chlorophyll. The most abundant and stable type is cytochrome c. By comparing different kinds of cytochromes, scientists can trace the evolutionary relationships of the organisms in which they occur.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They do so with the help of an enzyme, cytochrome oxidase, which carries electrons during the energy-transfer process.
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