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perihelionOne entry found. Main Entry: peri·he·lion Pronunciation: \ˌper-ə-ˈhēl-yən\ Function: noun Inflected Form(s): plural peri·he·lia \-ˈhēl-yə\ Etymology: New Latin, from peri- + Greek hēlios sun — more at solar Date: 1666 : 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
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