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phytochrome

[fahy-tuh-krohm] /ˈfaɪ təˌkroʊm/
noun, Botany
1.
a plant pigment that is associated with the absorption of light in the photoperiodic response and that may regulate various types of growth and development.
Origin
1890-1895
1890-95; phyto- + -chrome
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for phytochrome
  • phytochrome is a photoreceptor, a pigment that plants use to detect light.
  • Biochemically, phytochrome is a protein with a bilin chromophore.
  • A pigment of the imagination a history of phytochrome research.
British Dictionary definitions for phytochrome

phytochrome

/ˈfaɪtəʊˌkrəʊm/
noun
1.
(botany) a blue-green pigment existing in two interchangeable forms, present in most plants, that mediates many light-dependent processes, including photoperiodism and the greening of leaves
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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phytochrome in Science
phytochrome
  (fī'tə-krōm')   
Any of a group of cytoplasmic pigments found in green plants and some green algae that absorb red light and regulate dormancy, seed germination, and flowering. Phytochromes consist of a bile pigment attached to a protein, and occur in an active and inactive form, each of which can be converted into the other depending on the wavelength of red light that is absorbed.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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