any of several celestial objects, thought to be rotating neutron stars, which emit electromagnetic radiation, esp. radio waves, at short and very regular intervals: abbrev. PSR
Origin:
puls(e) + -ar
See pulsar in American Heritage Dictionary 4
noun
Any of several celestial radio sources emitting short intense bursts of radio waves, x-rays, or visible electromagnetic radiation at regular intervals, generally believed to be rotating neutron stars.