Definition of perihelian in English:

perihelian

adjective

Astronomy
rare
  • Of or relating to the perihelion of a planet, comet, etc.

Origin

Late 17th century; earliest use found in William Leybourn (1626–1716). From periheli- + -an.

Pronunciation

perihelian

/ˌpɛrɪˈhiːlɪən/