1. A small dense star that emits brief intense bursts of visible radiation, radio waves, and X-rays, and is generally believed to be a rapidly rotating neutron star.
2. A blend of pulse and quasar.

• Pulse: A brief temporary change in a normally constant quantity, e.g. in a voltage, or a series of intermittent disturbances that are regular in form and frequency of occurrence.
• Quasar: A compact object in space, usually with a large red shift indicating extreme remoteness, that emits huge amounts of energy, sometimes equal to the energy output of an entire galaxy.