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[aps] /æps/
noun
1.
Architecture. a semicircular or polygonal termination or recess in a building, usually vaulted and used especially at the end of a choir in a church.
2.
Astronomy. an apsis.
Origin
1815-1825
1815-25; variant of apsis
Related forms
apsidal
[ap-si-dl] /ˈæp sɪ dl/ (Show IPA),
adjective
apsidally, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for apsidal

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/æps/
noun
1.
Also called apsis. a domed or vaulted semicircular or polygonal recess, esp at the east end of a church
2.
(astronomy) another name for apsis (sense 1)
Derived Forms
apsidal (æpˈsaɪdəl; ˈæpsɪdəl) adjective
Word Origin
C19: from Latin apsis, from Greek: a fitting together, arch, from haptein to fasten
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 apsidal
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"semicircular extension at the end of a church," 1846, from L. apsis "an arch, a vault," from Gk. hapsis (Ionic apsis) "loop, arch," originally "a fastening, felloe of a wheel," from haptein "fasten together;" the original sense in Gk. seems to have been the joining of the arcs to form a circle, especially in making a wheel. The architectural term is earlier attested in Eng. in the L. form (1706).
Online Etymology Dictionary, © 2010 Douglas Harper
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10
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