Word.ws English Dictionary

subluminal

subluminal adjective: slower than light; having a speed less than light.

Adjective

subluminal (comparative more subluminal, superlative most subluminal)

  1. Slower than light; having a speed less than light.
    Synonyms:
    sublumic

Synonyms of subluminal

Forms of subluminal

comparativemore subluminal
superlativemost subluminal

Origin of subluminal

From sub- + luminal.

Questions about subluminal

What does subluminal mean?
Subluminal means slower than light; having a speed less than light.
What part of speech is subluminal?
Subluminal is an adjective.

Words near subluminal in the dictionary

  1. sublow
  2. sublucid
  3. sublumbal
  4. sublumbar
  5. sublumic
  6. subluminal
  7. subluminality
  8. subluminally
  9. subluminary
  10. subluminous
  11. sublunar

Source and license

Adapted from Wiktionary: subluminal (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “subluminal.” Word.ws, https://word.ws/subluminal. Based on Wiktionary, CC BY-SA 4.0.