Luxon

//ˈlʌk.sɒn// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Any particle that travels at exactly the speed of light and has zero mass: typically a photon.

Etymology

From Latin lux (“light”) + -on.

Related phrases

speed of light

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