supergalaxy means A very large, extended cluster of galaxies. Lexicurio rates it Sui generis — a strength score of 89 out of 100.
Etymology
From super- + galaxy.
noun
- A very large, extended cluster of galaxies.“Our galaxy, together with the ninety-three globular clusters and the two Magellanic Clouds, forms a sort of super-galaxy in space.”
- A single, isolated galaxy as a result of a wholesale merger of a galaxy cluster or group.“Our descendants will observe that they live in a blob of stars, which results from gravity pulling together a few nearby galaxies into one supergalaxy.”