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neutron star
Word forms: plural neutron stars
countable noun
A neutron star is a star that has collapsed under the weight of its own gravity.
neutron star in British English
noun
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
neutron star in American English
US
a collapsed star of extremely high density composed almost entirely of neutrons: pulsars are generally thought to be rotating neutron stars
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