— apsidal /ap"si dl/ , adj. — apsidally , adv.
/aps/ , 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.
[ 1815-25; var. of APSIS ]