1. Einstein cross - Noun
2. Einstein cross - Proper noun
Einstein cross (plural Einstein crosses)
(astronomy, physics) A gravitational lens configuration resulting in four duplicated images of the back ground image around the central gravitationally lensing object, in a cross configuration.
Einstein Cross
(astronomy) A quadruply replicated image of a quasar, in the configuration of a cross, surrounding a central foreground galaxy which caused the replication through gravitational lensing.