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

• superluminary