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sub-light

a. (context science fiction English) At less than the speed of light. alt. (context science fiction English) At less than the speed of light.

Usage examples of "sub-light".

But it seemed long, until the sub-light detectors bleeped, and told him that the Deux was safely below C.

Of course, now that they're traveling at sub-light speed, their fuel consumption rate has gone down ….

Erica LeMay came up with a scheme to give us power in the sub-light engines.

Retribution took a hit that damaged sub-light engines, and we had to lay up for a day.