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Meaning of phytochrome

phy•to•chrome

Pronunciation: (fī'tu-krōm"), [key]
— n. Bot.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.