Dictionary.com
definitions
  • synonyms

lower apsis

[loh-er]
See more synonyms on Thesaurus.com
noun
  1. See under apsis(def 1).

apsis

[ap-sis]
noun, plural ap·si·des [ap-si-deez] /ˈæp sɪˌdiz/.
  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 of apsis

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 Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for lower apsis

apsis

noun plural 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 (def. 1)
Derived Formsapsidal (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

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

lower apsis in Science

apsis

[ăpsĭs]
Plural apsides (ăpsĭ-dēz′)
  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.