a. [f. L. apsīd-em + -AL 1.]
1. Astr. Of or belonging to the apsides.
1859. in Worcester.
1860. All Y. Round, No. 52. 43/1. These two extreme points are also called apsides, whence the name of apsidal line given to the major axis of the orbit.
2. Arch. Of the form or nature of an apse.
1846. Hook, Ch. Dict., 56. The apsidal termination of the chancel is still common.
1876. M. Davies, Unorth. Lond., 254. Behind the choir there are seven apsidal and two rectangular chapels.
