from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The point in a solar orbit where the orbiting body is closest to the sun.
from The Century Dictionary.
- noun That point of the orbit of a planet or comet in which it is at its least distance from the sun: opposed to aphelion.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Astron.) That point of the orbit of a planet or comet which is nearest to the sun; -- opposed to
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy The
pointin the elliptical orbitof a planetor cometetc. where it is nearestto the Sun.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun
from The American Heritage® Dictionary of the English Language, 4th Edition
[Alteration of New Latin perihēlium : peri– + Greek hēlios, sun; see sāwel- in Indo-European roots.]
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