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n. pl. per·i·he·li·a (-hē′lē-ə, -hēl′yə)
The point in a solar orbit where the orbiting body is closest to the sun.
[Alteration of New Latin perihēlium : peri- + Greek hēlios, sun; see sāwel- in Indo-European roots.]
per′i·he′li·al (-hē′lē-əl, -hēl′yəl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n, pl -lia (-lɪə)
(Astronomy) the point in its orbit when a planet or comet is nearest the sun. Compare aphelion
[C17: from New Latin perihēlium, from peri- + Greek hēlios sun]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
per•i•he•li•on(ˌpɛr əˈhi li ən, -ˈhil yən)
n., pl. -he•li•a (-ˈhi li ə, -ˈhil yə)
the point in the orbit of a planet or comet at which it is nearest to the sun.
[1660–70; < Greek peri- peri- + hḗli(os) sun + -on neuter n. ending, on the model of perigee; earlier in the New Latin form perihelium]
per`i•he′li•al, per`i•he′li•an, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
The point nearest the sun in the orbit of a body, such as a planet or comet, that travels around the sun.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
the point in the orbit of a heavenly body where it is nearest the sun. Also called perihelium. See also aphelion.See also: Planets
the point in the orbit of a heavenly body where it is nearest the sun. Also spelled perihelium. Cf. aphelion.See also: Astronomy
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
The point in a planet’s orbit at which it is closest to the Sun.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
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|Noun||1.||perihelion - periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun|
aphelion - apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun
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