Subluminal

adj

adj ·Rare ·Advanced level

Definitions

Adjective
  1. 1
    Slower than light; having a speed less than light.

Synonyms

All synonyms
infraluminalsublumicsublumic

Etymology

From sub- + luminal.

Related phrases

slower than light

More for "subluminal"

SynonymsSentencesPronunciationTranslate

Next best steps

Find stronger synonymsSee usage examplesCheck pronunciationBrowse writing guides

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