Counterillumination

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A behaviour, found in some cephalopods etc., in which bioluminescence is used to provide camouflage when viewed from below. uncountable

Etymology

From counter- + illumination.

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