An Etymological Dictionary of Astronomy and Astrophysics

A → supernova remnant which has a filled center rather than being a shell. The internal region is “filled” by energetic particles streaming from a rotating → pulsar. The → Crab Nebula is the archetypal plerion.

See also: Plerion, from Gk. pleres “full,” akin to Pers. por “full,” → poly-.