from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A massive celestial object, such as a galaxy, whose gravity bends and focuses the light of a more distant object, resulting in a magnified, distorted, or multiple image of the original light source for a distant observer.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A massive body that produces distorted, magnified or multiple images of more distant objects when its gravitational field bends the path of light rays.
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