neutron star

noun
an extremely dense, compact star composed primarily of neutrons, especially the collapsed core of a supernova.

Origin:
1930–35

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World English Dictionary
neutron star
 
n
a star that has collapsed under its own gravity to a diameter of about 10 to 15 km. It is composed mostly of neutrons, has a mass of between 1.4 and about 3 times that of the sun, and a density in excess of 1017 kilograms per cubic metre

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American Heritage
Science Dictionary
neutron star  
A celestial object consisting of an extremely dense mass of neutrons, formed at the core of a supernova, where electrons and nuclei are compressed together so intensely by the force of gravity that protons and electrons merge together into neutrons. Though their mass is close to that of the Sun, the density of neutron stars is much higher—about 3 × 1011 kilograms per cubic centimeter (by comparison, the density of steel is 7.7 grams per cubic centimeter). Neutron stars are typically about 10 km across, and rotate very rapidly. Due to the spinning of electrically charged protons and electrons at their surfaces, their rotation gives rise to strong magnetic fields. The existence of neutron stars was predicted in the 1930s but was not confirmed until the discovery of the first pulsar in 1967. See more at pulsar.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

neutron star definition


A star about the size of the Earth, made almost entirely of neutrons. It is the end product of the evolution of some stars larger than the sun.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
It is later found to be a neutron star-a tiny, extremely dense star.
It could be a rapidly rotating, extremely dense neutron star called a pulsar.
When a star explodes, all that remains is a dense object known as a neutron
  star.
The decaying, oscillating tail that follows the spike displays many tens of
  cycles at the neutron star spin rate.
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