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[per-uh-hee-lee-uh n, -heel-yuh n] /ˌpɛr əˈhi li ən, -ˈhil yən/

noun, plural perihelia
[per-uh-hee-lee-uh, -heel-yuh] /ˌpɛr əˈhi li ə, -ˈhil yə/ (Show IPA). Astronomy.
the point in the orbit of a planet or comet at which it is nearest to the sun.
noun (pl) -lia (-lɪə)
the point in its orbit when a planet or comet is nearest the sun Compare aphelion

“point at which a celestial body is nearest the Sun,” 1680s, coined in Modern Latin (perihelium) by Kepler (1596) from Latinizations of Greek peri “near” (see peri-) + helios “sun” (see sol). Subsequently re-Greeked.

The point at which an orbiting object, such as a planet or a comet, is closest to the Sun. Compare aphelion, perigee.


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  • Peri-infarction block

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  • Perijejunitis

    perijejunitis per·i·je·ju·ni·tis (pěr’ē-jə-jōō’nī’tĭs, -ə-jē’ju-, -jěj’u-) n. Inflammation of the tissues surrounding the jejunum.

  • Perikaryon

    [per-i-kar-ee-on, -uh n] /ˌpɛr ɪˈkær iˌɒn, -ən/ noun, plural perikarya [per-i-kar-ee-uh] /ˌpɛr ɪˈkær i ə/ (Show IPA). Biology. 1. . perikaryon per·i·kar·y·on (pěr’ĭ-kār’ē-ŏn’, -ən) n. pl. per·i·kar·y·a (-kār’ē-ə)

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