Dictionary.com

Popular Searches

 Thesaurus.com

phototropy

British  
/ ˌfəʊtəʊˈtrəʊpɪ /

noun

  1. an alteration in the colour of certain substances as a result of being exposed to light of different wavelengths

  2. the reversible loss of colour of certain dyestuffs when illuminated at a particular wavelength

"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

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.