Definition of superlight in US English:

superlight

adjective

  • Extremely or exceptionally light.

adjective

Astronomy Physics
  • Designating a speed greater than that of light; = "superluminal".

Origin

Late 19th century; earliest use found in Transactions of the Philological Society. From super- + light<br>1920s; earliest use found in Scientific Monthly. From super- + light.