supercee
Faster-than-light travelling speed.
rare, uncountable
1960, AUTHOR UNKNOWN, Astounding Science-fiction, pp70, 72, & 73; presumed to be an earlier work (1930 or earlier), as quotations 2 and 3 also appear in:
Where it comes from
Presumed super- + cee, a respelling of the physics symbol c (denoting the speed of light in a vacuum; an abbreviation of both English constant and Latin celeritas (“swiftness”)).
Adapted from the Wiktionary entry supercee (CC BY-SA 4.0).