Dictionary
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Pronunciation: (aps), [key]—
n.
1. Archit.a semicircular or polygonal termination or recess in a building, usually vaulted and used esp. at the end of a choir in a church. See diag. under
basilica.
2. Astron.an apsis.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.