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Definitions of quasar on the Web:

One of a class of very distant (typically billions of light-years away),
extremely bright, and very small objects. The term "quasar'' means
"quasi-star'' — that is, something that looks like a star but can't actually
be a star. A typical quasar produces more light each second than an
entire galaxy of stars does, and it does so from a region of space which
is perhaps as small as our solar system. ...
www.astrosociety.org/education/publications/tnl/14/14.html
is a celestial object which appears "star-like" but is not explainable in
terms of the usual stellar properties. Many quasars have a visible "tail" -
supposedly a jet of material expelled from the quasar. Often quasars
emit anomalous amounts of radio waves.
www.grazian-archive.com/quantavolution/QuantaHTML/vol_05/solaria-binaria_glossary.htm
The brightest type of active galactic nucleus, believed to be powered by a
supermassive black hole. The word “quasar” is derived from quasi-stellar
radio source, because this type of object was first identified as a kind of
radio source. Quasars also are called quasi-stellar objects (QSOs).
Thousands of quasars have been observed, all at extreme distances from
our galaxy.
jwstsite.stsci.edu/reference_desk/glossary.shtml
“quasi-stellar” object. Originally thought to be peculiar stars in our own
galaxy, quasars are now believed to be the most remote objects in the
universe.
www.infoplease.com/ipa/A0004425.html
Quasi-stellar astronomical object, often a radio source; all quasars have
large red shifts and small optical diameter, but may have large radio
diameter. Also known as quasi-stellar object (QSO).
www.csa.com/hottopics/gravity/gloss.php
A star like object that has a large red shift and emits powerful blue light
and often radio waves.
www.wro.org/ras/glossary/n-r.htm
A quasi-stellar radio source or quasi-stellar object radiating extraordinary
power from a small region in space, having the following characteristics:
super galactic luminosity of 10 to 100,000 times that of the Milky Way;
compact power-source dimensions, on the order of a galactic core; extreme
distance from Earth; red shift indicating a velocity approaching 90 percent
of the speed of light; residence inside the core of a galaxies.
www.ccastronomy.org/terminology.htm
a quasi-stellar radio source. These peculiar objects emit radio waves with a
large redshift. The redshift represents the fraction of the percentage in which
the wavelengths are switched. Quasars are very far away, and very bright,
and many astronomers agree that giant black holes are present within these
objects. See also: black hole.
library.thinkquest.org/12523/glossary.html
Object which appears starlike but is very far away and so it is thought to be
a galaxy.
www.astro.virginia.edu/~rjp0i/museum/glossary.html
Extremely distant, incredibly luminous objects. They are now accepted to be
the exceedingly bright centres of certain galaxies, tiny central cores that put
out the power of perhaps a thousand ordinary galaxies.
outreach.atnf.csiro.au/education/senior/astrophysics/astrophysics_glossary.html
from QUAsiStellar Radio Source, an object at large redshift (z>0.1) showing
strong broad emission lines. Variability shows that the energy must arise in
a tiny region, although some quasars have hundreds of time the energy output
of normal galaxies. Their radio structures often include jets and lobes similar to
what we see from radio galaxies.
vega.bac.pku.edu.cn/~wuxb/agn/text.html
An object which appears as a star-like point of light, but emits more energy
than an entire galaxy. Many quasars also emit radio waves.
inkido.indiana.edu/a100/glossary1.html
Quasars, for "quasi-stellar radio source" were first noticed in the 1960's as
very bright distant star-like objects with a very large redshift. A quasar is now
thought to be the extremely distant, unusually bright nucleus of a galaxy
powered by a supermassive black hole. Quasars are the most powerful of the
category called "active galactic nuclei" (AGN). See more.
bell.mma.edu/~mdickins/Cosmos/GlossaryCosmos.html
a starlike object that may send out radio waves and other forms of energy;
many have large red shifts
wordnet.princeton.edu/perl/webwn
A quasar (acronym for QUASi-stellAR radio sources) is an astronomical
object that looks like a star in optical telescopes (i.e. it is a point source),
and has a very high redshift. The general consensus is that this high redshift
is cosmological, the result of Hubble's law, which implies that quasars must
be very distant and must emit more energy than dozens of normal galaxies.
en.wikipedia.org/wiki/Quasar

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