Share this entry

photochromic Line breaks: photo|chro¦mic
Pronunciation: /ˌfəʊtə(ʊ)ˈkrəʊmɪk/

Definition of photochromic in English:


(Of a substance) undergoing a reversible change in colour or shade when exposed to light of a particular frequency or intensity: photochromic sunglasses
More example sentences
  • When a photochromic material is exposed to light, the light absorption properties of the material change.
  • Also, photochromic substances can be restored to their original state after being in the dark for a period of time.
  • This reversible deprotonation and reprotonation causes the distinguished visible and fully reversible photochromic shift from purple to yellow.


1950s: from photo- 'relating to light' + Greek khrōma 'colour' + -ic.



Example sentences
  • Nagamura et al. have reported photochromism of the ion pair-charge transfer complexes of viologen derivatives with tetrakis [3,5-bis phenyl] borate as a counter anion.
  • Investigations of the spiro [cyclohexadiene-indolines] revealed the photochromism to be highly solvent dependent.
  • The wide interest for basic and applied research on photochromism in the last decade is well documented by two monographs.

Words that rhyme with photochromic

gnomic, monochromic, ohmic

Definition of photochromic in:

Share this entry


What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day innocuous
Pronunciation: ɪˈnɒkjʊəs
not harmful or offensive