Dictionary.com

phototropy

/ (ˌfəʊtəʊˈtrəʊpɪ) /
Save This Word!

noun chem
an alteration in the colour of certain substances as a result of being exposed to light of different wavelengths
the reversible loss of colour of certain dyestuffs when illuminated at a particular wavelength
QUIZ
CAN YOU ANSWER THESE COMMON GRAMMAR DEBATES?
There are grammar debates that never die; and the ones highlighted in the questions in this quiz are sure to rile everyone up once again. Do you know how to answer the questions that cause some of the greatest grammar debates?
Question 1 of 7
Which sentence is correct?
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
FEEDBACK