What does "photochromism" mean?

The reversible transformation of the optical properties of a material when exposed to electromagnetic radiation, especially the reversible darkening of a plastic lens when exposed to sunlight.

Photochromism

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
The reversible transformation of the optical properties of a material when exposed to electromagnetic radiation, especially the reversible darkening of a plastic lens when exposed to sunlight. countable, uncountable

Related phrases

electromagnetic radiation

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.