Wiktionary
lightlike
a. (context mathematics English) (''of a four-vector'') having a space component whose magnitude is equal to its time component multiplied by the speed of light
Usage examples of "lightlike".
But as before in the colony port area, a cool lightlike sensation seemed to bore into his forehead.
And with them eke, O Goddesse heauenly bright,Mirrour of grace and Maiestie diuine,Great Lady of the greatest Isle, whose lightLike Phoebus lampe throughout the world doth shine,Shed thy faire beames into my feeble eyne,And raise my thoughts too humble and too vile,To thinke of that true glorious type of thine,The argument of mine afflicted stile:The which to heare, vouchsafe, O dearest dred a-while.