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superluminal

[soo-per-loo-muh-nl]
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adjective Astronomy.
  1. appearing to travel faster than the speed of light.
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Origin of superluminal

super- + Latin lūmin-, stem of lūmen light + -al1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for superluminal

superluminal

adjective
  1. physics of or relating to a speed or velocity exceeding the speed of light
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012