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lower apsis

[loh-er] /ˈloʊ ər/
noun
1.
See under apsis (def 1).

apsis

[ap-sis] /ˈæp sɪs/
noun, plural apsides
[ap-si-deez] /ˈæp sɪˌdiz/ (Show IPA)
1.
Astronomy. either of two points in an eccentric orbit, one (higher apsis) farthest from the center of attraction, the other (lower apsis) nearest to the center of attraction.
2.
Architecture. an apse.
Origin
1595-1605
1595-1605; < Latin < Greek hapsís (felloe of) a wheel, arch, vault, orig., fastening, equivalent to háp(tein) to fasten + -sis -sis
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for lower-apsis

apsis

/ˈæpsɪs/
noun (pl) apsides (æpˈsaɪdiːz; ˈæpsɪˌdiːz)
1.
Also called apse. either of two points lying at the extremities of an eccentric orbit of a planet, satellite, etc, such as the aphelion and perihelion of a planet or the apogee and perigee of the moon. The line of apsides connects two such points and is the principal axis of the orbit
2.
another name for apse (sense 1)
Derived Forms
apsidal (æpˈsaɪdəl; ˈæpsɪdəl) adjective
Word Origin
C17: via Latin from Greek; see apse
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for lower-apsis

apsis

n.

"perigree of the moon, perihelion of a planet" (plural apsides), 1650s, from Latin apsis "arch, vault" (see apse).

Online Etymology Dictionary, © 2010 Douglas Harper
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lower-apsis in Science
apsis
  (āp'sĭs)   
Plural apsides (āp'sĭ-dēz')
In the path of an orbiting body, either of the two points at which it is closest to or farthest away from the body it is orbiting. See also apoapsis, periapsis.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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8
9
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