perihelion [per- uh- hee-lee- uh n, - heel-y uh n] Word Origin See more synonyms for perihelion on Thesaurus.com noun, plural per·i·he·li·a . [per- uh- hee-lee- uh, - heel-y uh] /ˌpɛr əˈhi li ə, -ˈhil yə/ . Astronomy the point in the orbit of a planet or comet at which it is nearest to the sun. Origin of perihelion 1660–70;
Greek peri- peri-
) sun +
neuter noun suffix, on the model of
; earlier in the
perihelium Related forms per·i·he·li·al, per·i·he·li·an, adjective
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for perihelial 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
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Word Origin and History for perihelial 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
perihelion [pĕr′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
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