noun, verb ·Rare ·Advanced level

Definitions

Noun

1. 1
   Any of several biochemical cycles, involving photoactive proteins, that take place in the retina when exposed to light

Verb

1. 1
   To undergo a photochemical cycle

Etymology

From photo- + cycle.

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