subluminary

English

Etymology

sub- +‎ luminary

Adjective

subluminary (not comparable)

  1. Slower than the speed of light.
    • 2017, A.K. Brown, Humans on the Menu (Champagne Universe Series: Book 2), page 34:
      The only consolation in their taking the Kator was that the ship was set at doing slow sub-luminary speeds.

Antonyms
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