Pulsar

[puhl-sahr] /ˈpʌl sɑr/

noun
1.
Astronomy. one of several hundred known celestial objects, generally believed to be rapidly rotating neutron stars, that emit pulses of radiation, especially radio waves, with a high degree of regularity.
/ˈpʌlˌsɑː/
noun
1.
any of a number of very small extremely dense objects first observed in 1967, which rotate very rapidly and emit very regular pulses of polarized radiation, esp radio waves. They are thought to be neutron stars formed following supernova explosions
n.

1968, from pulse (n.1), the form on analogy of quasar. When discovered in 1967, they were thought perhaps to be signals from alien civilizations and astronomers informally dubbed them LGM for “Little Green Men.”
pulsar
(pŭl’sär’)
A rapidly spinning neutron star that emits radiation, usually radio waves, in narrow beams focused by the star’s powerful magnetic field and streaming outward from its magnetic poles. Because the pulsar’s magnetic poles do not align with the poles of its rotational axis, the beams of radiation sweep around like the beacon of a lighthouse and are thus observed on Earth as short, regular pulses, with periods anywhere between 1 millisecond and 4 seconds.
pulsar [(pul-sahr)]

A rapidly rotating neutron star. The radiation from such a star appears to come in a series of regular pulses (one per revolution), which explains the name.