Dictionary

perihelion

noun peri·he·lion \ˌper-ə-ˈhēl-yən\
plural peri·he·lia\-ˈhēl-yə\

Definition of PERIHELION

:  the point in the path of a celestial body (as a planet) that is nearest to the sun — compare aphelion
peri·he·lial \-ˈhēl-yəl\ adjective

Origin of PERIHELION

New Latin, from peri- + Greek hēlios sun — more at solar
First Known Use: 1666

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