Dictionary.com
definitions
  • synonyms

phytochrome

[fahy-tuh-krohm]
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.
Show More

Origin of phytochrome

First recorded in 1890–95; phyto- + -chrome
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for phytochrome

phytochrome

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
Show More
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

phytochrome in Science

phytochrome

[fītə-krōm′]
  1. 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.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.