subluminal

Adjective

 * 1) slower than light; having a speed less than light.

Synonyms

 * periphrastic: causally reachable (physics)
 * periphrastic: causally reachable (physics)

Translations

 * Greek: υποφωτοταχικός, υποφωτοταχική, υποφωτοταχικό
 * Italian: subluminale