Definition of Hale–Bopp in US English:

Hale–Bopp

proper noun

  • A periodic comet which passed close to the sun in the spring of 1997 and was one of the brightest of the 20th century.

Origin

Named after Alan Hale and Thomas Bopp, the American astronomers who discovered it (independently of each other).

Pronunciation

Hale–Bopp

/ˌhālˈbäp/