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perihelion

[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
1.
the point in the orbit of a planet or comet at which it is nearest to the sun.
Compare aphelion.
Origin
1660-1670
1660-70; < Greek peri- peri- + hḗli(os) sun + -on neuter noun suffix, on the model of perigee; earlier in the Neo-Latin form perihelium
Related forms
perihelial, perihelian, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for perihelia

perihelion

/ˌpɛrɪˈhiːlɪən/
noun (pl) -lia (-lɪə)
1.
the point in its orbit when a planet or comet is nearest the sun Compare aphelion
Word Origin
C17: from New Latin perihēlium, from peri- + Greek hēlios sun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for perihelia

perihelion

n.

"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.

Online Etymology Dictionary, © 2010 Douglas Harper
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perihelia in Science
perihelion
  (pěr'ə-hē'lē-ən)   

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

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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