Try Our Apps


Is irregardless a word?


[fahy-tuh-krohm] /ˈfaɪ təˌkroʊm/
noun, Botany.
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 of phytochrome
1890-95; phyto- + -chrome Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
Cite This Source
British Dictionary definitions for phytochrome


(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
Cite This Source
phytochrome in Science
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.
Cite This Source

Word of the Day

Difficulty index for phytochrome

Few English speakers likely know this word

Word Value for phytochrome

Scrabble Words With Friends

Nearby words for phytochrome