X-ray star definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a star or starlike celestial object, esp. a nova or pulsar, that is a source of X-rays
X-ray star definition by American Heritage Dictionary
A celestial object, especially a star, that emits a major portion of its radiation in x-rays.