perihelion

play
noun peri·he·lion \ˌper-ə-ˈhēl-yən\

Definition of perihelion

plural

perihelia

play \ˌper-ə-ˈhēl-yə\
  1. :  the point nearest to the sun in the path of an orbiting celestial body (such as a planet) — compare aphelion

perihelial

play \ˌper-ə-ˈhēl-yəl\ adjective

Origin and Etymology of perihelion

New Latin, from peri- + Greek hēlios sun — more at solar


First Known Use: 1666


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the forefront of an action or movement

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