Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of several photoreceptive pigments in green plants that regulate processes such as flowering and seed germination.

from The Century Dictionary.

  • noun Same as xanthophyl.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun biochemistry Any of a class of pigments that control most photomorphogenic responses in higher plants.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

phyto- +‎ chrome

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