What is the equivalent of sub-/supersonic for the speed of light?

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Chapters
00:00 What Is The Equivalent Of Sub-/Supersonic For The Speed Of Light?
00:16 Accepted Answer Score 22
00:26 Answer 2 Score 4
00:37 Answer 3 Score 1
00:52 Thank you

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Tags
#singlewordrequests #adjectives #terminology

#avk47

ACCEPTED ANSWER

Score 22

I've seen superluminal and subluminal. Sometimes sub-lightspeed

ANSWER 2

Score 4

Particularly if you are referring to particles, you could use tachyonic for faster-than-light and bradyonic for slower-than-light.

ANSWER 3

Score 1

For speeds below the speed of light, you can consider the word sublight http://stargate.wikia.com/wiki/Sublight_engine

For speeds above the speed of light, you can consider F.T.L., meaning faster-than-light. See here