1. One of over a thousand known extragalactic objects, starlike in appearance and having spectra with characteristically large redshifts, that are thought to be the most distant and most luminous objects in the universe.
2. A blend of quasi and stellar.

• Quasi: As if; as though; as it were; in a manner sense or degree; having some resemblance to.
• Stellar: Relating to, consisting of, or like a star or stars.